nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <unistd.h>
  26 #include <limits.h>
  27
  28 #include <libfirm/firm.h>
  29 #include <libfirm/adt/obst.h>
  30 #include <libfirm/be.h>
  31
  32 #include "ast2firm.h"
  33
  34 #include "adt/error.h"
  35 #include "adt/array.h"
  36 #include "adt/strutil.h"
  37 #include "adt/util.h"
  38 #include "symbol_t.h"
  39 #include "token_t.h"
  40 #include "type_t.h"
  41 #include "ast_t.h"
  42 #include "entity_t.h"
  43 #include "parser.h"
  44 #include "diagnostic.h"
  45 #include "lang_features.h"
  46 #include "types.h"
  47 #include "type_hash.h"
  48 #include "mangle.h"
  49 #include "walk.h"
  50 #include "warning.h"
  51 #include "printer.h"
  52 #include "entitymap_t.h"
  53 #include "driver/firm_opt.h"
  54
  55 typedef struct trampoline_region trampoline_region;
  56 struct trampoline_region {
  57         ir_entity        *function;    /**< The function that is called by this trampoline */
  58         ir_entity        *region;      /**< created region for the trampoline */
  59 };
  60
  61 fp_model_t firm_fp_model = fp_model_precise;
  62
  63 static const backend_params *be_params;
  64
  65 static ir_type *ir_type_char;
  66 static ir_type *ir_type_wchar_t;
  67
  68 /* architecture specific floating point arithmetic mode (if any) */
  69 static ir_mode *mode_float_arithmetic;
  70
  71 /* alignment of stack parameters */
  72 static unsigned stack_param_align;
  73
  74 static int        next_value_number_function;
  75 static ir_node   *continue_label;
  76 static ir_node   *break_label;
  77 static ir_node   *current_switch;
  78 static bool       saw_default_label;
  79 static label_t  **all_labels;
  80 static entity_t **inner_functions;
  81 static ir_node   *ijmp_list;
  82 static bool       constant_folding;
  83
  84 static const entity_t     *current_function_entity;
  85 static ir_node            *current_function_name;
  86 static ir_node            *current_funcsig;
  87 static ir_graph           *current_function;
  88 static translation_unit_t *current_translation_unit;
  89 static trampoline_region  *current_trampolines;
  90 static ir_type            *current_outer_frame;
  91 static ir_node            *current_static_link;
  92 static ir_entity          *current_vararg_entity;
  93
  94 static entitymap_t  entitymap;
  95
  96 static struct obstack asm_obst;
  97
  98 typedef enum declaration_kind_t {
  99         DECLARATION_KIND_UNKNOWN,
 100         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 101         DECLARATION_KIND_GLOBAL_VARIABLE,
 102         DECLARATION_KIND_LOCAL_VARIABLE,
 103         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 104         DECLARATION_KIND_PARAMETER,
 105         DECLARATION_KIND_PARAMETER_ENTITY,
 106         DECLARATION_KIND_FUNCTION,
 107         DECLARATION_KIND_COMPOUND_MEMBER,
 108         DECLARATION_KIND_INNER_FUNCTION
 109 } declaration_kind_t;
 110
 111 static ir_type *get_ir_type_incomplete(type_t *type);
 112
 113 static void enqueue_inner_function(entity_t *entity)
 114 {
 115         if (inner_functions == NULL)
 116                 inner_functions = NEW_ARR_F(entity_t *, 0);
 117         ARR_APP1(entity_t*, inner_functions, entity);
 118 }
 119
 120 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 121 {
 122         const entity_t *entity = get_irg_loc_description(irg, pos);
 123
 124         if (entity != NULL) {
 125                 source_position_t const *const pos = &entity->base.source_position;
 126                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 127         }
 128         return new_r_Unknown(irg, mode);
 129 }
 130
 131 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 132 {
 133         source_position_t const *const pos = (source_position_t const*)dbg;
 134         if (pos) {
 135                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 136         } else {
 137                 return (src_loc_t){ NULL, 0, 0 };
 138         }
 139 }
 140
 141 static dbg_info *get_dbg_info(const source_position_t *pos)
 142 {
 143         return (dbg_info*) pos;
 144 }
 145
 146 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 147                                     const type_dbg_info *dbg)
 148 {
 149         assert(dbg != NULL);
 150         print_to_buffer(buffer, buffer_size);
 151         const type_t *type = (const type_t*) dbg;
 152         print_type(type);
 153         finish_print_to_buffer();
 154 }
 155
 156 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 157 {
 158         return (type_dbg_info*) type;
 159 }
 160
 161 /* is the current block a reachable one? */
 162 static bool currently_reachable(void)
 163 {
 164         ir_node *const block = get_cur_block();
 165         return block != NULL && !is_Bad(block);
 166 }
 167
 168 static void set_unreachable_now(void)
 169 {
 170         set_cur_block(NULL);
 171 }
 172
 173 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 174
 175 static ir_node *_expression_to_firm(const expression_t *expression);
 176 static ir_node *expression_to_firm(const expression_t *expression);
 177
 178 static unsigned decide_modulo_shift(unsigned type_size)
 179 {
 180         if (architecture_modulo_shift == 0)
 181                 return 0;
 182         if (type_size < architecture_modulo_shift)
 183                 return architecture_modulo_shift;
 184         return type_size;
 185 }
 186
 187 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 188 {
 189         unsigned flags = get_atomic_type_flags(kind);
 190         unsigned size  = get_atomic_type_size(kind);
 191         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 192             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 193                 if (size == 4) {
 194                         return get_modeF();
 195                 } else if (size == 8) {
 196                         return get_modeD();
 197                 } else {
 198                         panic("unexpected kind");
 199                 }
 200         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 201                 char            name[64];
 202                 unsigned        bit_size     = size * 8;
 203                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 204                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 205
 206                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 207                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 208                                     modulo_shift);
 209         }
 210
 211         return NULL;
 212 }
 213
 214 /**
 215  * Initialises the atomic modes depending on the machine size.
 216  */
 217 static void init_atomic_modes(void)
 218 {
 219         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 220         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 221                 if (atomic_modes[i] != NULL)
 222                         continue;
 223                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 224         }
 225 }
 226
 227 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 228 {
 229         assert(kind <= ATOMIC_TYPE_LAST);
 230         return atomic_modes[kind];
 231 }
 232
 233 static ir_node *get_vla_size(array_type_t *const type)
 234 {
 235         ir_node *size_node = type->size_node;
 236         if (size_node == NULL) {
 237                 size_node = expression_to_firm(type->size_expression);
 238                 type->size_node = size_node;
 239         }
 240         return size_node;
 241 }
 242
 243 static unsigned count_parameters(const function_type_t *function_type)
 244 {
 245         unsigned count = 0;
 246
 247         function_parameter_t *parameter = function_type->parameters;
 248         for ( ; parameter != NULL; parameter = parameter->next) {
 249                 ++count;
 250         }
 251
 252         return count;
 253 }
 254
 255 /**
 256  * Creates a Firm type for an atomic type
 257  */
 258 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 259 {
 260         ir_mode        *mode      = atomic_modes[akind];
 261         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 262         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 263         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 264
 265         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 266         set_type_alignment_bytes(irtype, alignment);
 267
 268         return irtype;
 269 }
 270
 271 /**
 272  * Creates a Firm type for a complex type
 273  */
 274 static ir_type *create_complex_type(const atomic_type_t *type)
 275 {
 276         atomic_type_kind_t  kind = type->akind;
 277         ir_mode            *mode = atomic_modes[kind];
 278         ident              *id   = get_mode_ident(mode);
 279
 280         (void) id;
 281
 282         /* FIXME: finish the array */
 283         return NULL;
 284 }
 285
 286 /**
 287  * Creates a Firm type for an imaginary type
 288  */
 289 static ir_type *create_imaginary_type(const atomic_type_t *type)
 290 {
 291         return create_atomic_type(type->akind, (const type_t*)type);
 292 }
 293
 294 /**
 295  * return type of a parameter (and take transparent union gnu extension into
 296  * account)
 297  */
 298 static type_t *get_parameter_type(type_t *orig_type)
 299 {
 300         type_t *type = skip_typeref(orig_type);
 301         if (is_type_union(type)
 302                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 303                 compound_t *compound = type->compound.compound;
 304                 type                 = compound->members.entities->declaration.type;
 305         }
 306
 307         return type;
 308 }
 309
 310 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 311 {
 312         type_t        *return_type  = skip_typeref(function_type->return_type);
 313
 314         int            n_parameters = count_parameters(function_type)
 315                                        + (for_closure ? 1 : 0);
 316         int            n_results    = is_type_void(return_type) ? 0 : 1;
 317         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 318         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 319
 320         if (!is_type_void(return_type)) {
 321                 ir_type *restype = get_ir_type(return_type);
 322                 set_method_res_type(irtype, 0, restype);
 323         }
 324
 325         function_parameter_t *parameter = function_type->parameters;
 326         int                   n         = 0;
 327         if (for_closure) {
 328                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 329                 set_method_param_type(irtype, n, p_irtype);
 330                 ++n;
 331         }
 332         for ( ; parameter != NULL; parameter = parameter->next) {
 333                 type_t  *type     = get_parameter_type(parameter->type);
 334                 ir_type *p_irtype = get_ir_type(type);
 335                 set_method_param_type(irtype, n, p_irtype);
 336                 ++n;
 337         }
 338
 339         bool is_variadic = function_type->variadic;
 340
 341         if (is_variadic)
 342                 set_method_variadicity(irtype, variadicity_variadic);
 343
 344         unsigned cc = get_method_calling_convention(irtype);
 345         switch (function_type->calling_convention) {
 346         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 347         case CC_CDECL:
 348 is_cdecl:
 349                 set_method_calling_convention(irtype, SET_CDECL(cc));
 350                 break;
 351
 352         case CC_STDCALL:
 353                 if (is_variadic)
 354                         goto is_cdecl;
 355
 356                 /* only non-variadic function can use stdcall, else use cdecl */
 357                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 358                 break;
 359
 360         case CC_FASTCALL:
 361                 if (is_variadic)
 362                         goto is_cdecl;
 363                 /* only non-variadic function can use fastcall, else use cdecl */
 364                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 365                 break;
 366
 367         case CC_THISCALL:
 368                 /* Hmm, leave default, not accepted by the parser yet. */
 369                 break;
 370         }
 371
 372         if (for_closure)
 373                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 374
 375         const decl_modifiers_t modifiers = function_type->modifiers;
 376         if (modifiers & DM_CONST)
 377                 add_method_additional_properties(irtype, mtp_property_const);
 378         if (modifiers & DM_PURE)
 379                 add_method_additional_properties(irtype, mtp_property_pure);
 380         if (modifiers & DM_RETURNS_TWICE)
 381                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 382         if (modifiers & DM_NORETURN)
 383                 add_method_additional_properties(irtype, mtp_property_noreturn);
 384         if (modifiers & DM_NOTHROW)
 385                 add_method_additional_properties(irtype, mtp_property_nothrow);
 386         if (modifiers & DM_MALLOC)
 387                 add_method_additional_properties(irtype, mtp_property_malloc);
 388
 389         return irtype;
 390 }
 391
 392 static ir_type *create_pointer_type(pointer_type_t *type)
 393 {
 394         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 395         type_t        *points_to    = type->points_to;
 396         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 397         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 398
 399         return irtype;
 400 }
 401
 402 static ir_type *create_reference_type(reference_type_t *type)
 403 {
 404         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 405         type_t        *refers_to    = type->refers_to;
 406         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 407         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 408
 409         return irtype;
 410 }
 411
 412 static ir_type *create_array_type(array_type_t *type)
 413 {
 414         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 415         type_t        *element_type    = type->element_type;
 416         ir_type       *ir_element_type = get_ir_type(element_type);
 417         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 418
 419         const int align = get_type_alignment_bytes(ir_element_type);
 420         set_type_alignment_bytes(irtype, align);
 421
 422         if (type->size_constant) {
 423                 int n_elements = type->size;
 424
 425                 set_array_bounds_int(irtype, 0, 0, n_elements);
 426
 427                 size_t elemsize = get_type_size_bytes(ir_element_type);
 428                 if (elemsize % align > 0) {
 429                         elemsize += align - (elemsize % align);
 430                 }
 431                 set_type_size_bytes(irtype, n_elements * elemsize);
 432         } else {
 433                 set_array_lower_bound_int(irtype, 0, 0);
 434         }
 435         set_type_state(irtype, layout_fixed);
 436
 437         return irtype;
 438 }
 439
 440 /**
 441  * Return the signed integer type of size bits.
 442  *
 443  * @param size   the size
 444  */
 445 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 446                                                  unsigned size,
 447                                                                                                  const type_t *type)
 448 {
 449         static ir_mode *s_modes[64 + 1] = {NULL, };
 450         ir_type *res;
 451         ir_mode *mode;
 452
 453         if (size <= 0 || size > 64)
 454                 return NULL;
 455
 456         mode = s_modes[size];
 457         if (mode == NULL) {
 458                 char name[32];
 459
 460                 snprintf(name, sizeof(name), "bf_I%u", size);
 461                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 462                 s_modes[size] = mode;
 463         }
 464
 465         type_dbg_info *dbgi = get_type_dbg_info_(type);
 466         res                 = new_d_type_primitive(mode, dbgi);
 467         set_primitive_base_type(res, base_tp);
 468
 469         return res;
 470 }
 471
 472 /**
 473  * Return the unsigned integer type of size bits.
 474  *
 475  * @param size   the size
 476  */
 477 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 478                                                    unsigned size,
 479                                                                                                    const type_t *type)
 480 {
 481         static ir_mode *u_modes[64 + 1] = {NULL, };
 482         ir_type *res;
 483         ir_mode *mode;
 484
 485         if (size <= 0 || size > 64)
 486                 return NULL;
 487
 488         mode = u_modes[size];
 489         if (mode == NULL) {
 490                 char name[32];
 491
 492                 snprintf(name, sizeof(name), "bf_U%u", size);
 493                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 494                 u_modes[size] = mode;
 495         }
 496
 497         type_dbg_info *dbgi = get_type_dbg_info_(type);
 498         res = new_d_type_primitive(mode, dbgi);
 499         set_primitive_base_type(res, base_tp);
 500
 501         return res;
 502 }
 503
 504 static ir_type *create_bitfield_type(const entity_t *entity)
 505 {
 506         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 507         type_t *base = skip_typeref(entity->declaration.type);
 508         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 509         ir_type *irbase = get_ir_type(base);
 510
 511         unsigned bit_size = entity->compound_member.bit_size;
 512
 513         assert(!is_type_float(base));
 514         if (is_type_signed(base)) {
 515                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 516         } else {
 517                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 518         }
 519 }
 520
 521 /**
 522  * Construct firm type from ast struct type.
 523  */
 524 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 525 {
 526         compound_t *compound = type->compound;
 527
 528         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 529                 return compound->irtype;
 530         }
 531
 532         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 533
 534         symbol_t *type_symbol = compound->base.symbol;
 535         ident    *id;
 536         if (type_symbol != NULL) {
 537                 id = new_id_from_str(type_symbol->string);
 538         } else {
 539                 if (is_union) {
 540                         id = id_unique("__anonymous_union.%u");
 541                 } else {
 542                         id = id_unique("__anonymous_struct.%u");
 543                 }
 544         }
 545
 546         ir_type *irtype;
 547         if (is_union) {
 548                 irtype = new_type_union(id);
 549         } else {
 550                 irtype = new_type_struct(id);
 551         }
 552
 553         compound->irtype_complete = false;
 554         compound->irtype          = irtype;
 555
 556         if (incomplete)
 557                 return irtype;
 558
 559         if (is_union) {
 560                 layout_union_type(type);
 561         } else {
 562                 layout_struct_type(type);
 563         }
 564
 565         compound->irtype_complete = true;
 566
 567         entity_t *entry = compound->members.entities;
 568         for ( ; entry != NULL; entry = entry->base.next) {
 569                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 570                         continue;
 571
 572                 symbol_t *symbol     = entry->base.symbol;
 573                 type_t   *entry_type = entry->declaration.type;
 574                 ident    *ident;
 575                 if (symbol == NULL) {
 576                         /* anonymous bitfield member, skip */
 577                         if (entry->compound_member.bitfield)
 578                                 continue;
 579                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 580                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 581                         ident = id_unique("anon.%u");
 582                 } else {
 583                         ident = new_id_from_str(symbol->string);
 584                 }
 585
 586                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 587
 588                 ir_type *entry_irtype;
 589                 if (entry->compound_member.bitfield) {
 590                         entry_irtype = create_bitfield_type(entry);
 591                 } else {
 592                         entry_irtype = get_ir_type(entry_type);
 593                 }
 594                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 595
 596                 set_entity_offset(entity, entry->compound_member.offset);
 597                 set_entity_offset_bits_remainder(entity,
 598                                                  entry->compound_member.bit_offset);
 599
 600                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 601                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 602                 entry->compound_member.entity = entity;
 603         }
 604
 605         set_type_alignment_bytes(irtype, compound->alignment);
 606         set_type_size_bytes(irtype, compound->size);
 607         set_type_state(irtype, layout_fixed);
 608
 609         return irtype;
 610 }
 611
 612 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 613
 614 static void determine_enum_values(enum_type_t *const type)
 615 {
 616         ir_mode   *const mode    = atomic_modes[type->base.akind];
 617         ir_tarval *const one     = get_mode_one(mode);
 618         ir_tarval *      tv_next = get_mode_null(mode);
 619
 620         enum_t   *enume = type->enume;
 621         entity_t *entry = enume->base.next;
 622         for (; entry != NULL; entry = entry->base.next) {
 623                 if (entry->kind != ENTITY_ENUM_VALUE)
 624                         break;
 625
 626                 expression_t *const init = entry->enum_value.value;
 627                 if (init != NULL) {
 628                         tv_next = fold_constant_to_tarval(init);
 629                 }
 630                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 631                 entry->enum_value.tv = tv_next;
 632                 tv_next = tarval_add(tv_next, one);
 633         }
 634 }
 635
 636 static ir_type *create_enum_type(enum_type_t *const type)
 637 {
 638         return create_atomic_type(type->base.akind, (const type_t*) type);
 639 }
 640
 641 static ir_type *get_ir_type_incomplete(type_t *type)
 642 {
 643         assert(type != NULL);
 644         type = skip_typeref(type);
 645
 646         if (type->base.firm_type != NULL) {
 647                 return type->base.firm_type;
 648         }
 649
 650         if (is_type_compound(type)) {
 651                 return create_compound_type(&type->compound, true);
 652         } else {
 653                 return get_ir_type(type);
 654         }
 655 }
 656
 657 ir_type *get_ir_type(type_t *type)
 658 {
 659         assert(type != NULL);
 660
 661         type = skip_typeref(type);
 662
 663         if (type->base.firm_type != NULL) {
 664                 return type->base.firm_type;
 665         }
 666
 667         ir_type *firm_type = NULL;
 668         switch (type->kind) {
 669         case TYPE_ATOMIC:
 670                 firm_type = create_atomic_type(type->atomic.akind, type);
 671                 break;
 672         case TYPE_COMPLEX:
 673                 firm_type = create_complex_type(&type->atomic);
 674                 break;
 675         case TYPE_IMAGINARY:
 676                 firm_type = create_imaginary_type(&type->atomic);
 677                 break;
 678         case TYPE_FUNCTION:
 679                 firm_type = create_method_type(&type->function, false);
 680                 break;
 681         case TYPE_POINTER:
 682                 firm_type = create_pointer_type(&type->pointer);
 683                 break;
 684         case TYPE_REFERENCE:
 685                 firm_type = create_reference_type(&type->reference);
 686                 break;
 687         case TYPE_ARRAY:
 688                 firm_type = create_array_type(&type->array);
 689                 break;
 690         case TYPE_COMPOUND_STRUCT:
 691         case TYPE_COMPOUND_UNION:
 692                 firm_type = create_compound_type(&type->compound, false);
 693                 break;
 694         case TYPE_ENUM:
 695                 firm_type = create_enum_type(&type->enumt);
 696                 break;
 697
 698         case TYPE_ERROR:
 699         case TYPE_TYPEOF:
 700         case TYPE_TYPEDEF:
 701                 break;
 702         }
 703         if (firm_type == NULL)
 704                 panic("unknown type found");
 705
 706         type->base.firm_type = firm_type;
 707         return firm_type;
 708 }
 709
 710 static ir_mode *get_ir_mode_storage(type_t *type)
 711 {
 712         type = skip_typeref(type);
 713
 714         /* Firm doesn't report a mode for arrays and structs/unions. */
 715         if (!is_type_scalar(type)) {
 716                 return mode_P_data;
 717         }
 718
 719         ir_type *const irtype = get_ir_type(type);
 720         ir_mode *const mode   = get_type_mode(irtype);
 721         assert(mode != NULL);
 722         return mode;
 723 }
 724
 725 /*
 726  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 727  * int that it returns bigger modes for floating point on some platforms
 728  * (x87 internally does arithemtic with 80bits)
 729  */
 730 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 731 {
 732         ir_mode *mode = get_ir_mode_storage(type);
 733         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 734                 return mode_float_arithmetic;
 735         }
 736
 737         return mode;
 738 }
 739
 740 /**
 741  * Return a node representing the size of a type.
 742  */
 743 static ir_node *get_type_size_node(type_t *type)
 744 {
 745         unsigned size;
 746         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 747         type = skip_typeref(type);
 748
 749         if (is_type_array(type) && type->array.is_vla) {
 750                 ir_node *size_node = get_vla_size(&type->array);
 751                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 752                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 753                 return real_size;
 754         }
 755
 756         size = get_type_size(type);
 757         return new_Const_long(mode, size);
 758 }
 759
 760 /** Names of the runtime functions. */
 761 static const struct {
 762         int        id;           /**< the rts id */
 763         int        n_res;        /**< number of return values */
 764         const char *name;        /**< the name of the rts function */
 765         int        n_params;     /**< number of parameters */
 766         unsigned   flags;        /**< language flags */
 767 } rts_data[] = {
 768         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 769         { rts_abort,      0, "abort",        0, _C89 },
 770         { rts_alloca,     1, "alloca",       1, _ALL },
 771         { rts_abs,        1, "abs",          1, _C89 },
 772         { rts_labs,       1, "labs",         1, _C89 },
 773         { rts_llabs,      1, "llabs",        1, _C99 },
 774         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 775
 776         { rts_fabs,       1, "fabs",         1, _C89 },
 777         { rts_sqrt,       1, "sqrt",         1, _C89 },
 778         { rts_cbrt,       1, "cbrt",         1, _C99 },
 779         { rts_exp,        1, "exp",          1, _C89 },
 780         { rts_exp2,       1, "exp2",         1, _C89 },
 781         { rts_exp10,      1, "exp10",        1, _GNUC },
 782         { rts_log,        1, "log",          1, _C89 },
 783         { rts_log2,       1, "log2",         1, _C89 },
 784         { rts_log10,      1, "log10",        1, _C89 },
 785         { rts_pow,        1, "pow",          2, _C89 },
 786         { rts_sin,        1, "sin",          1, _C89 },
 787         { rts_cos,        1, "cos",          1, _C89 },
 788         { rts_tan,        1, "tan",          1, _C89 },
 789         { rts_asin,       1, "asin",         1, _C89 },
 790         { rts_acos,       1, "acos",         1, _C89 },
 791         { rts_atan,       1, "atan",         1, _C89 },
 792         { rts_sinh,       1, "sinh",         1, _C89 },
 793         { rts_cosh,       1, "cosh",         1, _C89 },
 794         { rts_tanh,       1, "tanh",         1, _C89 },
 795
 796         { rts_fabsf,      1, "fabsf",        1, _C99 },
 797         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 798         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 799         { rts_expf,       1, "expf",         1, _C99 },
 800         { rts_exp2f,      1, "exp2f",        1, _C99 },
 801         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 802         { rts_logf,       1, "logf",         1, _C99 },
 803         { rts_log2f,      1, "log2f",        1, _C99 },
 804         { rts_log10f,     1, "log10f",       1, _C99 },
 805         { rts_powf,       1, "powf",         2, _C99 },
 806         { rts_sinf,       1, "sinf",         1, _C99 },
 807         { rts_cosf,       1, "cosf",         1, _C99 },
 808         { rts_tanf,       1, "tanf",         1, _C99 },
 809         { rts_asinf,      1, "asinf",        1, _C99 },
 810         { rts_acosf,      1, "acosf",        1, _C99 },
 811         { rts_atanf,      1, "atanf",        1, _C99 },
 812         { rts_sinhf,      1, "sinhf",        1, _C99 },
 813         { rts_coshf,      1, "coshf",        1, _C99 },
 814         { rts_tanhf,      1, "tanhf",        1, _C99 },
 815
 816         { rts_fabsl,      1, "fabsl",        1, _C99 },
 817         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 818         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 819         { rts_expl,       1, "expl",         1, _C99 },
 820         { rts_exp2l,      1, "exp2l",        1, _C99 },
 821         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 822         { rts_logl,       1, "logl",         1, _C99 },
 823         { rts_log2l,      1, "log2l",        1, _C99 },
 824         { rts_log10l,     1, "log10l",       1, _C99 },
 825         { rts_powl,       1, "powl",         2, _C99 },
 826         { rts_sinl,       1, "sinl",         1, _C99 },
 827         { rts_cosl,       1, "cosl",         1, _C99 },
 828         { rts_tanl,       1, "tanl",         1, _C99 },
 829         { rts_asinl,      1, "asinl",        1, _C99 },
 830         { rts_acosl,      1, "acosl",        1, _C99 },
 831         { rts_atanl,      1, "atanl",        1, _C99 },
 832         { rts_sinhl,      1, "sinhl",        1, _C99 },
 833         { rts_coshl,      1, "coshl",        1, _C99 },
 834         { rts_tanhl,      1, "tanhl",        1, _C99 },
 835
 836         { rts_strcmp,     1, "strcmp",       2, _C89 },
 837         { rts_strncmp,    1, "strncmp",      3, _C89 },
 838         { rts_strcpy,     1, "strcpy",       2, _C89 },
 839         { rts_strlen,     1, "strlen",       1, _C89 },
 840         { rts_memcpy,     1, "memcpy",       3, _C89 },
 841         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 842         { rts_memmove,    1, "memmove",      3, _C89 },
 843         { rts_memset,     1, "memset",       3, _C89 },
 844         { rts_memcmp,     1, "memcmp",       3, _C89 },
 845 };
 846
 847 static ident *rts_idents[lengthof(rts_data)];
 848
 849 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 850
 851 void set_create_ld_ident(ident *(*func)(entity_t*))
 852 {
 853         create_ld_ident = func;
 854 }
 855
 856 static bool declaration_is_definition(const entity_t *entity)
 857 {
 858         switch (entity->kind) {
 859         case ENTITY_VARIABLE:
 860                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 861         case ENTITY_FUNCTION:
 862                 return entity->function.statement != NULL;
 863         case ENTITY_PARAMETER:
 864         case ENTITY_COMPOUND_MEMBER:
 865                 return false;
 866         case ENTITY_TYPEDEF:
 867         case ENTITY_ENUM:
 868         case ENTITY_ENUM_VALUE:
 869         case ENTITY_NAMESPACE:
 870         case ENTITY_LABEL:
 871         case ENTITY_LOCAL_LABEL:
 872                 break;
 873         }
 874         panic("declaration_is_definition called on non-declaration");
 875 }
 876
 877 /**
 878  * Handle GNU attributes for entities
 879  *
 880  * @param ent   the entity
 881  * @param decl  the routine declaration
 882  */
 883 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 884 {
 885         assert(is_declaration(entity));
 886         decl_modifiers_t modifiers = entity->declaration.modifiers;
 887
 888         if (is_method_entity(irentity)) {
 889                 if (modifiers & DM_PURE) {
 890                         set_entity_additional_properties(irentity, mtp_property_pure);
 891                 }
 892                 if (modifiers & DM_CONST) {
 893                         add_entity_additional_properties(irentity, mtp_property_const);
 894                 }
 895         }
 896         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 897                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 898         }
 899         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 900             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 901                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 902         }
 903 }
 904
 905 static bool is_main(entity_t *entity)
 906 {
 907         static symbol_t *sym_main = NULL;
 908         if (sym_main == NULL) {
 909                 sym_main = symbol_table_insert("main");
 910         }
 911
 912         if (entity->base.symbol != sym_main)
 913                 return false;
 914         /* must be in outermost scope */
 915         if (entity->base.parent_scope != &current_translation_unit->scope)
 916                 return false;
 917
 918         return true;
 919 }
 920
 921 /**
 922  * Creates an entity representing a function.
 923  *
 924  * @param entity       the function declaration/definition
 925  * @param owner_type   the owner type of this function, NULL
 926  *                     for global functions
 927  */
 928 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 929 {
 930         assert(entity->kind == ENTITY_FUNCTION);
 931         if (entity->function.irentity != NULL)
 932                 return entity->function.irentity;
 933
 934         switch (entity->function.btk) {
 935         case BUILTIN_NONE:
 936         case BUILTIN_LIBC:
 937         case BUILTIN_LIBC_CHECK:
 938                 break;
 939         default:
 940                 return NULL;
 941         }
 942
 943         symbol_t *symbol = entity->base.symbol;
 944         ident    *id     = new_id_from_str(symbol->string);
 945
 946         /* already an entity defined? */
 947         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 948         bool const has_body = entity->function.statement != NULL;
 949         if (irentity != NULL) {
 950                 goto entity_created;
 951         }
 952
 953         ir_type *ir_type_method;
 954         if (entity->function.need_closure)
 955                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 956         else
 957                 ir_type_method = get_ir_type(entity->declaration.type);
 958
 959         bool nested_function = false;
 960         if (owner_type == NULL)
 961                 owner_type = get_glob_type();
 962         else
 963                 nested_function = true;
 964
 965         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 966         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 967
 968         ident *ld_id;
 969         if (nested_function)
 970                 ld_id = id_unique("inner.%u");
 971         else
 972                 ld_id = create_ld_ident(entity);
 973         set_entity_ld_ident(irentity, ld_id);
 974
 975         handle_decl_modifiers(irentity, entity);
 976
 977         if (! nested_function) {
 978                 storage_class_tag_t const storage_class
 979                         = (storage_class_tag_t) entity->declaration.storage_class;
 980                 if (storage_class == STORAGE_CLASS_STATIC) {
 981                     set_entity_visibility(irentity, ir_visibility_local);
 982                 } else {
 983                     set_entity_visibility(irentity, ir_visibility_external);
 984                 }
 985
 986                 bool const is_inline = entity->function.is_inline;
 987                 if (is_inline && has_body) {
 988                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
 989                             || ((c_mode & _C99) == 0
 990                                 && storage_class == STORAGE_CLASS_EXTERN)) {
 991                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
 992                         }
 993                 }
 994         } else {
 995                 /* nested functions are always local */
 996                 set_entity_visibility(irentity, ir_visibility_local);
 997         }
 998
 999         /* We should check for file scope here, but as long as we compile C only
1000            this is not needed. */
1001         if (!freestanding && !has_body) {
1002                 /* check for a known runtime function */
1003                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1004                         if (id != rts_idents[i])
1005                                 continue;
1006
1007                         function_type_t *function_type
1008                                 = &entity->declaration.type->function;
1009                         /* rts_entities code can't handle a "wrong" number of parameters */
1010                         if (function_type->unspecified_parameters)
1011                                 continue;
1012
1013                         /* check number of parameters */
1014                         int n_params = count_parameters(function_type);
1015                         if (n_params != rts_data[i].n_params)
1016                                 continue;
1017
1018                         type_t *return_type = skip_typeref(function_type->return_type);
1019                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1020                         if (n_res != rts_data[i].n_res)
1021                                 continue;
1022
1023                         /* ignore those rts functions not necessary needed for current mode */
1024                         if ((c_mode & rts_data[i].flags) == 0)
1025                                 continue;
1026                         assert(rts_entities[rts_data[i].id] == NULL);
1027                         rts_entities[rts_data[i].id] = irentity;
1028                 }
1029         }
1030
1031         entitymap_insert(&entitymap, symbol, irentity);
1032
1033 entity_created:
1034         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1035         entity->function.irentity = irentity;
1036
1037         return irentity;
1038 }
1039
1040 /**
1041  * Creates a SymConst for a given entity.
1042  *
1043  * @param dbgi    debug info
1044  * @param entity  the entity
1045  */
1046 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1047 {
1048         assert(entity != NULL);
1049         union symconst_symbol sym;
1050         sym.entity_p = entity;
1051         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1052 }
1053
1054 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1055 {
1056         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1057 }
1058
1059 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1060                                    ir_mode *dest_mode)
1061 {
1062         if (is_Const(value)) {
1063                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1064         }
1065
1066         ir_node *cond       = new_d_Cond(dbgi, value);
1067         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1068         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1069         ir_node *tblock     = new_Block(1, &proj_true);
1070         ir_node *fblock     = new_Block(1, &proj_false);
1071         set_cur_block(tblock);
1072         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1073         ir_node *tjump  = new_Jmp();
1074         set_cur_block(fblock);
1075         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1076         ir_node *fjump  = new_Jmp();
1077
1078         ir_node *in[2]      = { tjump, fjump };
1079         ir_node *mergeblock = new_Block(2, in);
1080         set_cur_block(mergeblock);
1081         ir_node *phi_in[2]  = { const1, const0 };
1082         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1083         return phi;
1084 }
1085
1086 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1087 {
1088         ir_mode *value_mode = get_irn_mode(value);
1089
1090         if (value_mode == dest_mode)
1091                 return value;
1092
1093         if (dest_mode == mode_b) {
1094                 ir_node *zero = new_Const(get_mode_null(value_mode));
1095                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1096                 return cmp;
1097         } else if (value_mode == mode_b) {
1098                 return create_conv_from_b(dbgi, value, dest_mode);
1099         }
1100
1101         return new_d_Conv(dbgi, value, dest_mode);
1102 }
1103
1104 /**
1105  * Creates a SymConst node representing a string constant.
1106  *
1107  * @param src_pos    the source position of the string constant
1108  * @param id_prefix  a prefix for the name of the generated string constant
1109  * @param value      the value of the string constant
1110  */
1111 static ir_node *string_to_firm(source_position_t const *const src_pos, char const *const id_prefix, string_encoding_t const enc, string_t const *const value)
1112 {
1113         size_t            slen;
1114         ir_type          *elem_type;
1115         ir_initializer_t *initializer;
1116         switch (enc) {
1117         case STRING_ENCODING_CHAR: {
1118                 slen        = value->size + 1;
1119                 elem_type   = ir_type_char;
1120                 initializer = create_initializer_compound(slen);
1121
1122                 ir_mode *const mode = get_type_mode(elem_type);
1123                 char const    *p    = value->begin;
1124                 for (size_t i = 0; i < slen; ++i) {
1125                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1126                         ir_initializer_t *val = create_initializer_tarval(tv);
1127                         set_initializer_compound_value(initializer, i, val);
1128                 }
1129                 goto finish;
1130         }
1131
1132         case STRING_ENCODING_WIDE: {
1133                 slen        = wstrlen(value) + 1;
1134                 elem_type   = ir_type_wchar_t;
1135                 initializer = create_initializer_compound(slen);
1136
1137                 ir_mode *const mode = get_type_mode(elem_type);
1138                 char const    *p    = value->begin;
1139                 for (size_t i = 0; i < slen; ++i) {
1140                         assert(p <= value->begin + value->size);
1141                         utf32             v   = read_utf8_char(&p);
1142                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1143                         ir_initializer_t *val = create_initializer_tarval(tv);
1144                         set_initializer_compound_value(initializer, i, val);
1145                 }
1146                 goto finish;
1147         }
1148         }
1149         panic("invalid string encoding");
1150
1151 finish:;
1152         ir_type *const type = new_type_array(1, elem_type);
1153         set_array_bounds_int(type, 0, 0, slen);
1154         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1155         set_type_state(      type, layout_fixed);
1156
1157         ir_type   *const global_type = get_glob_type();
1158         ident     *const id          = id_unique(id_prefix);
1159         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1160         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1161         set_entity_ld_ident(   entity, id);
1162         set_entity_visibility( entity, ir_visibility_private);
1163         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1164         set_entity_initializer(entity, initializer);
1165
1166         return create_symconst(dbgi, entity);
1167 }
1168
1169 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1170 {
1171         const char *string = literal->value.begin;
1172         size_t      size   = literal->value.size;
1173
1174         assert(type->kind == TYPE_ATOMIC);
1175         atomic_type_kind_t akind = type->atomic.akind;
1176
1177         ir_mode   *const mode = atomic_modes[akind];
1178         ir_tarval *const tv   = new_tarval_from_str(string, size, mode);
1179         if (tv == tarval_bad)
1180                 return false;
1181
1182         literal->base.type    = type;
1183         literal->target_value = tv;
1184         return true;
1185 }
1186
1187 static void create_integer_tarval(literal_expression_t *literal)
1188 {
1189         /* -1: signed only, 0: any, 1: unsigned only */
1190         int             sign   = literal->value.begin[0] != '0' /* decimal */ ? -1 : 0;
1191         unsigned        ls     = 0;
1192         const string_t *suffix = &literal->suffix;
1193         /* parse suffix */
1194         if (suffix->size > 0) {
1195                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1196                         if (*c == 'u' || *c == 'U') sign = 1;
1197                         if (*c == 'l' || *c == 'L') { ++ls; }
1198                 }
1199         }
1200
1201         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1202
1203         /* now try if the constant is small enough for some types */
1204         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1205         if (ls < 1) {
1206                 if (sign <= 0 && try_create_integer(literal, type_int))
1207                         goto finished;
1208                 if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1209                         goto finished;
1210         }
1211         if (ls < 2) {
1212                 if (sign <= 0 && try_create_integer(literal, type_long))
1213                         goto finished;
1214                 if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1215                         goto finished;
1216         }
1217         /* last try? then we should not report tarval_bad */
1218         if (sign < 0)
1219                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1220         if (sign <= 0 && try_create_integer(literal, type_long_long))
1221                 goto finished;
1222
1223         /* last try */
1224         assert(sign >= 0);
1225         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1226         bool res = try_create_integer(literal, type_unsigned_long_long);
1227         if (!res)
1228                 panic("internal error when parsing number literal");
1229
1230 finished:
1231         tarval_set_integer_overflow_mode(old_mode);
1232 }
1233
1234 void determine_literal_type(literal_expression_t *literal)
1235 {
1236         switch (literal->base.kind) {
1237         case EXPR_LITERAL_INTEGER:
1238                 create_integer_tarval(literal);
1239                 return;
1240         default:
1241                 break;
1242         }
1243 }
1244
1245 /**
1246  * Creates a Const node representing a constant.
1247  */
1248 static ir_node *literal_to_firm(const literal_expression_t *literal)
1249 {
1250         type_t     *type   = skip_typeref(literal->base.type);
1251         ir_mode    *mode   = get_ir_mode_storage(type);
1252         const char *string = literal->value.begin;
1253         size_t      size   = literal->value.size;
1254         ir_tarval  *tv;
1255
1256         switch (literal->base.kind) {
1257         case EXPR_LITERAL_WIDE_CHARACTER: {
1258                 utf32  v = read_utf8_char(&string);
1259                 char   buf[128];
1260                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1261
1262                 tv = new_tarval_from_str(buf, len, mode);
1263                 break;
1264         }
1265
1266         case EXPR_LITERAL_CHARACTER: {
1267                 long long int v;
1268                 bool char_is_signed
1269                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1270                 if (size == 1 && char_is_signed) {
1271                         v = (signed char)string[0];
1272                 } else {
1273                         v = 0;
1274                         for (size_t i = 0; i < size; ++i) {
1275                                 v = (v << 8) | ((unsigned char)string[i]);
1276                         }
1277                 }
1278                 char   buf[128];
1279                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1280
1281                 tv = new_tarval_from_str(buf, len, mode);
1282                 break;
1283         }
1284
1285         case EXPR_LITERAL_INTEGER:
1286                 assert(literal->target_value != NULL);
1287                 tv = literal->target_value;
1288                 break;
1289
1290         case EXPR_LITERAL_FLOATINGPOINT:
1291                 tv = new_tarval_from_str(string, size, mode);
1292                 break;
1293
1294         case EXPR_LITERAL_BOOLEAN:
1295                 if (string[0] == 't') {
1296                         tv = get_mode_one(mode);
1297                 } else {
1298                         assert(string[0] == 'f');
1299         case EXPR_LITERAL_MS_NOOP:
1300                         tv = get_mode_null(mode);
1301                 }
1302                 break;
1303
1304         default:
1305                 panic("Invalid literal kind found");
1306         }
1307
1308         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1309         ir_node  *res        = new_d_Const(dbgi, tv);
1310         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1311         return create_conv(dbgi, res, mode_arith);
1312 }
1313
1314 /*
1315  * Allocate an area of size bytes aligned at alignment
1316  * at a frame type.
1317  */
1318 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1319 {
1320         static unsigned area_cnt = 0;
1321         char buf[32];
1322
1323         ir_type *tp = new_type_array(1, ir_type_char);
1324         set_array_bounds_int(tp, 0, 0, size);
1325         set_type_alignment_bytes(tp, alignment);
1326
1327         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1328         ident *name = new_id_from_str(buf);
1329         ir_entity *area = new_entity(frame_type, name, tp);
1330
1331         /* mark this entity as compiler generated */
1332         set_entity_compiler_generated(area, 1);
1333         return area;
1334 }
1335
1336 /**
1337  * Return a node representing a trampoline region
1338  * for a given function entity.
1339  *
1340  * @param dbgi    debug info
1341  * @param entity  the function entity
1342  */
1343 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1344 {
1345         ir_entity *region = NULL;
1346         int        i;
1347
1348         if (current_trampolines != NULL) {
1349                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1350                         if (current_trampolines[i].function == entity) {
1351                                 region = current_trampolines[i].region;
1352                                 break;
1353                         }
1354                 }
1355         } else {
1356                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1357         }
1358         ir_graph *irg = current_ir_graph;
1359         if (region == NULL) {
1360                 /* create a new region */
1361                 ir_type           *frame_tp = get_irg_frame_type(irg);
1362                 trampoline_region  reg;
1363                 reg.function = entity;
1364
1365                 reg.region   = alloc_trampoline(frame_tp,
1366                                                 be_params->trampoline_size,
1367                                                 be_params->trampoline_align);
1368                 ARR_APP1(trampoline_region, current_trampolines, reg);
1369                 region = reg.region;
1370         }
1371         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1372                                region);
1373 }
1374
1375 /**
1376  * Creates a trampoline for a function represented by an entity.
1377  *
1378  * @param dbgi    debug info
1379  * @param mode    the (reference) mode for the function address
1380  * @param entity  the function entity
1381  */
1382 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1383                                   ir_entity *entity)
1384 {
1385         assert(entity != NULL);
1386         ir_node *in[3];
1387         in[0] = get_trampoline_region(dbgi, entity);
1388         in[1] = create_symconst(dbgi, entity);
1389         in[2] = get_irg_frame(current_ir_graph);
1390
1391         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1392         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1393         return new_Proj(irn, mode, pn_Builtin_max+1);
1394 }
1395
1396 /**
1397  * Dereference an address.
1398  *
1399  * @param dbgi  debug info
1400  * @param type  the type of the dereferenced result (the points_to type)
1401  * @param addr  the address to dereference
1402  */
1403 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1404                                       ir_node *const addr)
1405 {
1406         type_t *skipped = skip_typeref(type);
1407         if (is_type_incomplete(skipped))
1408                 return addr;
1409
1410         ir_type *irtype = get_ir_type(skipped);
1411         if (is_compound_type(irtype)
1412             || is_Method_type(irtype)
1413             || is_Array_type(irtype)) {
1414                 return addr;
1415         }
1416
1417         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1418                                   ? cons_volatile : cons_none;
1419         ir_mode *const mode     = get_type_mode(irtype);
1420         ir_node *const memory   = get_store();
1421         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1422         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1423         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1424
1425         set_store(load_mem);
1426
1427         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1428         return create_conv(dbgi, load_res, mode_arithmetic);
1429 }
1430
1431 /**
1432  * Creates a strict Conv (to the node's mode) if necessary.
1433  *
1434  * @param dbgi  debug info
1435  * @param node  the node to strict conv
1436  */
1437 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1438 {
1439         ir_mode *mode = get_irn_mode(node);
1440
1441         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1442                 return node;
1443         if (!mode_is_float(mode))
1444                 return node;
1445
1446         /* check if there is already a Conv */
1447         if (is_Conv(node)) {
1448                 /* convert it into a strict Conv */
1449                 set_Conv_strict(node, 1);
1450                 return node;
1451         }
1452
1453         /* otherwise create a new one */
1454         return new_d_strictConv(dbgi, node, mode);
1455 }
1456
1457 /**
1458  * Returns the correct base address depending on whether it is a parameter or a
1459  * normal local variable.
1460  */
1461 static ir_node *get_local_frame(ir_entity *const ent)
1462 {
1463         ir_graph      *const irg   = current_ir_graph;
1464         const ir_type *const owner = get_entity_owner(ent);
1465         if (owner == current_outer_frame) {
1466                 assert(current_static_link != NULL);
1467                 return current_static_link;
1468         } else {
1469                 return get_irg_frame(irg);
1470         }
1471 }
1472
1473 /**
1474  * Keep all memory edges of the given block.
1475  */
1476 static void keep_all_memory(ir_node *block)
1477 {
1478         ir_node *old = get_cur_block();
1479
1480         set_cur_block(block);
1481         keep_alive(get_store());
1482         /* TODO: keep all memory edges from restricted pointers */
1483         set_cur_block(old);
1484 }
1485
1486 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1487 {
1488         entity_t *entity = ref->entity;
1489         if (entity->enum_value.tv == NULL) {
1490                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1491                 assert(type->kind == TYPE_ENUM);
1492                 determine_enum_values(&type->enumt);
1493         }
1494
1495         return new_Const(entity->enum_value.tv);
1496 }
1497
1498 static ir_node *reference_addr(const reference_expression_t *ref)
1499 {
1500         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1501         entity_t *entity = ref->entity;
1502         assert(is_declaration(entity));
1503
1504         if (entity->kind == ENTITY_FUNCTION
1505             && entity->function.btk != BUILTIN_NONE) {
1506                 ir_entity *irentity = get_function_entity(entity, NULL);
1507                 /* for gcc compatibility we have to produce (dummy) addresses for some
1508                  * builtins which don't have entities */
1509                 if (irentity == NULL) {
1510                         source_position_t const *const pos = &ref->base.source_position;
1511                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1512
1513                         /* simply create a NULL pointer */
1514                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1515                         ir_node  *res  = new_Const(get_mode_null(mode));
1516
1517                         return res;
1518                 }
1519         }
1520
1521         switch((declaration_kind_t) entity->declaration.kind) {
1522         case DECLARATION_KIND_UNKNOWN:
1523                 break;
1524         case DECLARATION_KIND_PARAMETER:
1525         case DECLARATION_KIND_LOCAL_VARIABLE:
1526                 /* you can store to a local variable (so we don't panic but return NULL
1527                  * as an indicator for no real address) */
1528                 return NULL;
1529         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1530                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1531                 return addr;
1532         }
1533
1534         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1535         case DECLARATION_KIND_PARAMETER_ENTITY: {
1536                 ir_entity *irentity = entity->variable.v.entity;
1537                 ir_node   *frame    = get_local_frame(irentity);
1538                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1539                 return sel;
1540         }
1541
1542         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1543                 return entity->variable.v.vla_base;
1544
1545         case DECLARATION_KIND_FUNCTION: {
1546                 return create_symconst(dbgi, entity->function.irentity);
1547         }
1548
1549         case DECLARATION_KIND_INNER_FUNCTION: {
1550                 type_t  *const type = skip_typeref(entity->declaration.type);
1551                 ir_mode *const mode = get_ir_mode_storage(type);
1552                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1553                         /* inner function not using the closure */
1554                         return create_symconst(dbgi, entity->function.irentity);
1555                 } else {
1556                         /* need trampoline here */
1557                         return create_trampoline(dbgi, mode, entity->function.irentity);
1558                 }
1559         }
1560
1561         case DECLARATION_KIND_COMPOUND_MEMBER:
1562                 panic("not implemented reference type");
1563         }
1564
1565         panic("reference to declaration with unknown type found");
1566 }
1567
1568 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1569 {
1570         dbg_info *const dbgi   = get_dbg_info(&ref->base.source_position);
1571         entity_t *const entity = ref->entity;
1572         assert(is_declaration(entity));
1573
1574         switch ((declaration_kind_t)entity->declaration.kind) {
1575         case DECLARATION_KIND_LOCAL_VARIABLE:
1576         case DECLARATION_KIND_PARAMETER: {
1577                 type_t  *const type  = skip_typeref(entity->declaration.type);
1578                 ir_mode *const mode  = get_ir_mode_storage(type);
1579                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1580                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1581         }
1582
1583         default: {
1584                 ir_node *const addr = reference_addr(ref);
1585                 return deref_address(dbgi, entity->declaration.type, addr);
1586         }
1587         }
1588 }
1589
1590 /**
1591  * Transform calls to builtin functions.
1592  */
1593 static ir_node *process_builtin_call(const call_expression_t *call)
1594 {
1595         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1596
1597         assert(call->function->kind == EXPR_REFERENCE);
1598         reference_expression_t *builtin = &call->function->reference;
1599
1600         type_t *expr_type = skip_typeref(builtin->base.type);
1601         assert(is_type_pointer(expr_type));
1602
1603         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1604
1605         switch (builtin->entity->function.btk) {
1606         case BUILTIN_NONE:
1607                 break;
1608         case BUILTIN_ALLOCA: {
1609                 expression_t *argument = call->arguments->expression;
1610                 ir_node      *size     = expression_to_firm(argument);
1611
1612                 ir_node *store  = get_store();
1613                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1614                                               stack_alloc);
1615                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1616                 set_store(proj_m);
1617                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1618
1619                 return res;
1620         }
1621         case BUILTIN_INF: {
1622                 type_t    *type = function_type->function.return_type;
1623                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1624                 ir_tarval *tv   = get_mode_infinite(mode);
1625                 ir_node   *res  = new_d_Const(dbgi, tv);
1626                 return res;
1627         }
1628         case BUILTIN_NAN: {
1629                 /* Ignore string for now... */
1630                 assert(is_type_function(function_type));
1631                 type_t    *type = function_type->function.return_type;
1632                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1633                 ir_tarval *tv   = get_mode_NAN(mode);
1634                 ir_node   *res  = new_d_Const(dbgi, tv);
1635                 return res;
1636         }
1637         case BUILTIN_EXPECT: {
1638                 expression_t *argument = call->arguments->expression;
1639                 return _expression_to_firm(argument);
1640         }
1641         case BUILTIN_VA_END:
1642                 /* evaluate the argument of va_end for its side effects */
1643                 _expression_to_firm(call->arguments->expression);
1644                 return NULL;
1645         case BUILTIN_OBJECT_SIZE: {
1646                 /* determine value of "type" */
1647                 expression_t *type_expression = call->arguments->next->expression;
1648                 long          type_val        = fold_constant_to_int(type_expression);
1649                 type_t       *type            = function_type->function.return_type;
1650                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1651                 /* just produce a "I don't know" result */
1652                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1653                                                 get_mode_minus_one(mode);
1654
1655                 return new_d_Const(dbgi, result);
1656         }
1657         case BUILTIN_ROTL: {
1658                 ir_node *val  = expression_to_firm(call->arguments->expression);
1659                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1660                 ir_mode *mode = get_irn_mode(val);
1661                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1662                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1663         }
1664         case BUILTIN_ROTR: {
1665                 ir_node *val  = expression_to_firm(call->arguments->expression);
1666                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1667                 ir_mode *mode = get_irn_mode(val);
1668                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1669                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1670                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1671                 return new_d_Rotl(dbgi, val, sub, mode);
1672         }
1673         case BUILTIN_FIRM:
1674                 break;
1675         case BUILTIN_LIBC:
1676         case BUILTIN_LIBC_CHECK:
1677                 panic("builtin did not produce an entity");
1678         }
1679         panic("invalid builtin found");
1680 }
1681
1682 /**
1683  * Transform a call expression.
1684  * Handles some special cases, like alloca() calls, which must be resolved
1685  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1686  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1687  * handled right...
1688  */
1689 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1690 {
1691         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1692         assert(currently_reachable());
1693
1694         expression_t   *function = call->function;
1695         ir_node        *callee   = NULL;
1696         bool            firm_builtin = false;
1697         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1698         if (function->kind == EXPR_REFERENCE) {
1699                 const reference_expression_t *ref    = &function->reference;
1700                 entity_t                     *entity = ref->entity;
1701
1702                 if (entity->kind == ENTITY_FUNCTION) {
1703                         builtin_kind_t builtin = entity->function.btk;
1704                         if (builtin == BUILTIN_FIRM) {
1705                                 firm_builtin = true;
1706                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1707                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1708                                    && builtin != BUILTIN_LIBC_CHECK) {
1709                                 return process_builtin_call(call);
1710                         }
1711                 }
1712         }
1713         if (!firm_builtin)
1714                 callee = expression_to_firm(function);
1715
1716         type_t *type = skip_typeref(function->base.type);
1717         assert(is_type_pointer(type));
1718         pointer_type_t *pointer_type = &type->pointer;
1719         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1720         assert(is_type_function(points_to));
1721         function_type_t *function_type = &points_to->function;
1722
1723         int      n_parameters    = 0;
1724         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1725         ir_type *new_method_type = NULL;
1726         if (function_type->variadic || function_type->unspecified_parameters) {
1727                 const call_argument_t *argument = call->arguments;
1728                 for ( ; argument != NULL; argument = argument->next) {
1729                         ++n_parameters;
1730                 }
1731
1732                 /* we need to construct a new method type matching the call
1733                  * arguments... */
1734                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1735                 int n_res       = get_method_n_ress(ir_method_type);
1736                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1737                 set_method_calling_convention(new_method_type,
1738                                get_method_calling_convention(ir_method_type));
1739                 set_method_additional_properties(new_method_type,
1740                                get_method_additional_properties(ir_method_type));
1741                 set_method_variadicity(new_method_type,
1742                                        get_method_variadicity(ir_method_type));
1743
1744                 for (int i = 0; i < n_res; ++i) {
1745                         set_method_res_type(new_method_type, i,
1746                                             get_method_res_type(ir_method_type, i));
1747                 }
1748                 argument = call->arguments;
1749                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1750                         expression_t *expression = argument->expression;
1751                         ir_type      *irtype     = get_ir_type(expression->base.type);
1752                         set_method_param_type(new_method_type, i, irtype);
1753                 }
1754                 ir_method_type = new_method_type;
1755         } else {
1756                 n_parameters = get_method_n_params(ir_method_type);
1757         }
1758
1759         ir_node *in[n_parameters];
1760
1761         const call_argument_t *argument = call->arguments;
1762         for (int n = 0; n < n_parameters; ++n) {
1763                 expression_t *expression = argument->expression;
1764                 ir_node      *arg_node   = expression_to_firm(expression);
1765
1766                 type_t *arg_type = skip_typeref(expression->base.type);
1767                 if (!is_type_compound(arg_type)) {
1768                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1769                         arg_node = create_conv(dbgi, arg_node, mode);
1770                         arg_node = do_strict_conv(dbgi, arg_node);
1771                 }
1772
1773                 in[n] = arg_node;
1774
1775                 argument = argument->next;
1776         }
1777
1778         ir_node *store;
1779         if (function_type->modifiers & DM_CONST) {
1780                 store = get_irg_no_mem(current_ir_graph);
1781         } else {
1782                 store = get_store();
1783         }
1784
1785         ir_node *node;
1786         type_t  *return_type = skip_typeref(function_type->return_type);
1787         ir_node *result      = NULL;
1788         if (firm_builtin) {
1789                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1790                                      ir_method_type);
1791                 if (! (function_type->modifiers & DM_CONST)) {
1792                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1793                         set_store(mem);
1794                 }
1795
1796                 if (!is_type_void(return_type)) {
1797                         assert(is_type_scalar(return_type));
1798                         ir_mode *mode = get_ir_mode_storage(return_type);
1799                         result = new_Proj(node, mode, pn_Builtin_max+1);
1800                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1801                         result              = create_conv(NULL, result, mode_arith);
1802                 }
1803         } else {
1804                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1805                 if (! (function_type->modifiers & DM_CONST)) {
1806                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1807                         set_store(mem);
1808                 }
1809
1810                 if (!is_type_void(return_type)) {
1811                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1812                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1813                         result                    = new_Proj(resproj, mode, 0);
1814                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1815                         result                    = create_conv(NULL, result, mode_arith);
1816                 }
1817         }
1818
1819         if (function_type->modifiers & DM_NORETURN) {
1820                 /* A dead end:  Keep the Call and the Block.  Also place all further
1821                  * nodes into a new and unreachable block. */
1822                 keep_alive(node);
1823                 keep_alive(get_cur_block());
1824                 ir_node *block = new_Block(0, NULL);
1825                 set_cur_block(block);
1826         }
1827
1828         return result;
1829 }
1830
1831 static ir_node *statement_to_firm(statement_t *statement);
1832 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1833
1834 static ir_node *expression_to_addr(const expression_t *expression);
1835 static ir_node *create_condition_evaluation(const expression_t *expression,
1836                                             ir_node *true_block,
1837                                             ir_node *false_block);
1838
1839 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1840                          ir_node *value)
1841 {
1842         if (!is_type_compound(type)) {
1843                 ir_mode *mode = get_ir_mode_storage(type);
1844                 value         = create_conv(dbgi, value, mode);
1845                 value         = do_strict_conv(dbgi, value);
1846         }
1847
1848         ir_node *memory = get_store();
1849
1850         if (is_type_scalar(type)) {
1851                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1852                                       ? cons_volatile : cons_none;
1853                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1854                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1855                 set_store(store_mem);
1856         } else {
1857                 ir_type *irtype    = get_ir_type(type);
1858                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1859                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1860                 set_store(copyb_mem);
1861         }
1862 }
1863
1864 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1865 {
1866         ir_tarval *all_one   = get_mode_all_one(mode);
1867         int        mode_size = get_mode_size_bits(mode);
1868         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1869
1870         assert(offset >= 0);
1871         assert(size   >= 0);
1872         assert(offset + size <= mode_size);
1873         if (size == mode_size) {
1874                 return all_one;
1875         }
1876
1877         long       shiftr    = get_mode_size_bits(mode) - size;
1878         long       shiftl    = offset;
1879         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1880         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1881         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1882         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1883
1884         return mask1;
1885 }
1886
1887 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1888                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1889                 bool need_return)
1890 {
1891         ir_type *entity_type = get_entity_type(entity);
1892         ir_type *base_type   = get_primitive_base_type(entity_type);
1893         ir_mode *mode        = get_type_mode(base_type);
1894         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1895
1896         value = create_conv(dbgi, value, mode);
1897
1898         /* kill upper bits of value and shift to right position */
1899         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1900         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1901         unsigned  base_bits  = get_mode_size_bits(mode);
1902         unsigned  shiftwidth = base_bits - bitsize;
1903
1904         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1905         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1906
1907         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1908         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1909         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1910
1911         /* load current value */
1912         ir_node   *mem             = get_store();
1913         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1914                                           set_volatile ? cons_volatile : cons_none);
1915         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1916         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1917         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1918         ir_tarval *inv_mask        = tarval_not(shift_mask);
1919         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1920         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1921
1922         /* construct new value and store */
1923         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1924         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1925                                          set_volatile ? cons_volatile : cons_none);
1926         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1927         set_store(store_mem);
1928
1929         if (!need_return)
1930                 return NULL;
1931
1932         ir_node *res_shr;
1933         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1934         if (mode_is_signed(mode)) {
1935                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1936         } else {
1937                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1938         }
1939         return res_shr;
1940 }
1941
1942 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1943                                          ir_node *addr)
1944 {
1945         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
1946         entity_t *entity    = expression->compound_entry;
1947         type_t   *base_type = entity->declaration.type;
1948         ir_mode  *mode      = get_ir_mode_storage(base_type);
1949         ir_node  *mem       = get_store();
1950         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1951         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1952         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1953         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1954
1955         ir_mode  *amode     = mode;
1956         /* optimisation, since shifting in modes < machine_size is usually
1957          * less efficient */
1958         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1959                 amode = mode_uint;
1960         }
1961         unsigned amode_size = get_mode_size_bits(amode);
1962         load_res = create_conv(dbgi, load_res, amode);
1963
1964         set_store(load_mem);
1965
1966         /* kill upper bits */
1967         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1968         unsigned   bitoffset   = entity->compound_member.bit_offset;
1969         unsigned   bitsize     = entity->compound_member.bit_size;
1970         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1971         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1972         ir_node   *countl      = new_d_Const(dbgi, tvl);
1973         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1974
1975         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1976         assert(shift_bitsr <= amode_size);
1977         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1978         ir_node   *countr      = new_d_Const(dbgi, tvr);
1979         ir_node   *shiftr;
1980         if (mode_is_signed(mode)) {
1981                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
1982         } else {
1983                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
1984         }
1985
1986         type_t  *type    = expression->base.type;
1987         ir_mode *resmode = get_ir_mode_arithmetic(type);
1988         return create_conv(dbgi, shiftr, resmode);
1989 }
1990
1991 /* make sure the selected compound type is constructed */
1992 static void construct_select_compound(const select_expression_t *expression)
1993 {
1994         type_t *type = skip_typeref(expression->compound->base.type);
1995         if (is_type_pointer(type)) {
1996                 type = type->pointer.points_to;
1997         }
1998         (void) get_ir_type(type);
1999 }
2000
2001 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2002                                               ir_node *value, ir_node *addr)
2003 {
2004         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2005         type_t   *type = skip_typeref(expression->base.type);
2006
2007         if (!is_type_compound(type)) {
2008                 ir_mode  *mode = get_ir_mode_storage(type);
2009                 value          = create_conv(dbgi, value, mode);
2010                 value          = do_strict_conv(dbgi, value);
2011         }
2012
2013         if (expression->kind == EXPR_REFERENCE) {
2014                 const reference_expression_t *ref = &expression->reference;
2015
2016                 entity_t *entity = ref->entity;
2017                 assert(is_declaration(entity));
2018                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2019                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2020                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2021                         set_value(entity->variable.v.value_number, value);
2022                         return value;
2023                 }
2024         }
2025
2026         if (addr == NULL)
2027                 addr = expression_to_addr(expression);
2028         assert(addr != NULL);
2029
2030         if (expression->kind == EXPR_SELECT) {
2031                 const select_expression_t *select = &expression->select;
2032
2033                 construct_select_compound(select);
2034
2035                 entity_t *entity = select->compound_entry;
2036                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2037                 if (entity->compound_member.bitfield) {
2038                         ir_entity *irentity = entity->compound_member.entity;
2039                         bool       set_volatile
2040                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2041                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2042                                                        set_volatile, true);
2043                         return value;
2044                 }
2045         }
2046
2047         assign_value(dbgi, addr, type, value);
2048         return value;
2049 }
2050
2051 static void set_value_for_expression(const expression_t *expression,
2052                                      ir_node *value)
2053 {
2054         set_value_for_expression_addr(expression, value, NULL);
2055 }
2056
2057 static ir_node *get_value_from_lvalue(const expression_t *expression,
2058                                       ir_node *addr)
2059 {
2060         if (expression->kind == EXPR_REFERENCE) {
2061                 const reference_expression_t *ref = &expression->reference;
2062
2063                 entity_t *entity = ref->entity;
2064                 assert(entity->kind == ENTITY_VARIABLE
2065                                 || entity->kind == ENTITY_PARAMETER);
2066                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2067                 int value_number;
2068                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2069                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2070                         value_number = entity->variable.v.value_number;
2071                         assert(addr == NULL);
2072                         type_t  *type = skip_typeref(expression->base.type);
2073                         ir_mode *mode = get_ir_mode_storage(type);
2074                         ir_node *res  = get_value(value_number, mode);
2075                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2076                 }
2077         }
2078
2079         assert(addr != NULL);
2080         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2081
2082         ir_node *value;
2083         if (expression->kind == EXPR_SELECT &&
2084             expression->select.compound_entry->compound_member.bitfield) {
2085             construct_select_compound(&expression->select);
2086                 value = bitfield_extract_to_firm(&expression->select, addr);
2087         } else {
2088                 value = deref_address(dbgi, expression->base.type, addr);
2089         }
2090
2091         return value;
2092 }
2093
2094
2095 static ir_node *create_incdec(const unary_expression_t *expression)
2096 {
2097         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2098         const expression_t *value_expr = expression->value;
2099         ir_node            *addr       = expression_to_addr(value_expr);
2100         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2101
2102         type_t  *type = skip_typeref(expression->base.type);
2103         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2104
2105         ir_node *offset;
2106         if (is_type_pointer(type)) {
2107                 pointer_type_t *pointer_type = &type->pointer;
2108                 offset = get_type_size_node(pointer_type->points_to);
2109         } else {
2110                 assert(is_type_arithmetic(type));
2111                 offset = new_Const(get_mode_one(mode));
2112         }
2113
2114         ir_node *result;
2115         ir_node *store_value;
2116         switch(expression->base.kind) {
2117         case EXPR_UNARY_POSTFIX_INCREMENT:
2118                 result      = value;
2119                 store_value = new_d_Add(dbgi, value, offset, mode);
2120                 break;
2121         case EXPR_UNARY_POSTFIX_DECREMENT:
2122                 result      = value;
2123                 store_value = new_d_Sub(dbgi, value, offset, mode);
2124                 break;
2125         case EXPR_UNARY_PREFIX_INCREMENT:
2126                 result      = new_d_Add(dbgi, value, offset, mode);
2127                 store_value = result;
2128                 break;
2129         case EXPR_UNARY_PREFIX_DECREMENT:
2130                 result      = new_d_Sub(dbgi, value, offset, mode);
2131                 store_value = result;
2132                 break;
2133         default:
2134                 panic("no incdec expr in create_incdec");
2135         }
2136
2137         set_value_for_expression_addr(value_expr, store_value, addr);
2138
2139         return result;
2140 }
2141
2142 static bool is_local_variable(expression_t *expression)
2143 {
2144         if (expression->kind != EXPR_REFERENCE)
2145                 return false;
2146         reference_expression_t *ref_expr = &expression->reference;
2147         entity_t               *entity   = ref_expr->entity;
2148         if (entity->kind != ENTITY_VARIABLE)
2149                 return false;
2150         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2151         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2152 }
2153
2154 static ir_relation get_relation(const expression_kind_t kind)
2155 {
2156         switch(kind) {
2157         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2158         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2159         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2160         case EXPR_BINARY_ISLESS:
2161         case EXPR_BINARY_LESS:          return ir_relation_less;
2162         case EXPR_BINARY_ISLESSEQUAL:
2163         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2164         case EXPR_BINARY_ISGREATER:
2165         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2166         case EXPR_BINARY_ISGREATEREQUAL:
2167         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2168         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2169
2170         default:
2171                 break;
2172         }
2173         panic("trying to get pn_Cmp from non-comparison binexpr type");
2174 }
2175
2176 /**
2177  * Handle the assume optimizer hint: check if a Confirm
2178  * node can be created.
2179  *
2180  * @param dbi    debug info
2181  * @param expr   the IL assume expression
2182  *
2183  * we support here only some simple cases:
2184  *  - var rel const
2185  *  - const rel val
2186  *  - var rel var
2187  */
2188 static ir_node *handle_assume_compare(dbg_info *dbi,
2189                                       const binary_expression_t *expression)
2190 {
2191         expression_t *op1 = expression->left;
2192         expression_t *op2 = expression->right;
2193         entity_t     *var2, *var = NULL;
2194         ir_node      *res      = NULL;
2195         ir_relation   relation = get_relation(expression->base.kind);
2196
2197         if (is_local_variable(op1) && is_local_variable(op2)) {
2198                 var  = op1->reference.entity;
2199             var2 = op2->reference.entity;
2200
2201                 type_t  *const type = skip_typeref(var->declaration.type);
2202                 ir_mode *const mode = get_ir_mode_storage(type);
2203
2204                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2205                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2206
2207                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2208                 set_value(var2->variable.v.value_number, res);
2209
2210                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2211                 set_value(var->variable.v.value_number, res);
2212
2213                 return res;
2214         }
2215
2216         expression_t *con = NULL;
2217         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2218                 var = op1->reference.entity;
2219                 con = op2;
2220         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2221                 relation = get_inversed_relation(relation);
2222                 var = op2->reference.entity;
2223                 con = op1;
2224         }
2225
2226         if (var != NULL) {
2227                 type_t  *const type = skip_typeref(var->declaration.type);
2228                 ir_mode *const mode = get_ir_mode_storage(type);
2229
2230                 res = get_value(var->variable.v.value_number, mode);
2231                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2232                 set_value(var->variable.v.value_number, res);
2233         }
2234         return res;
2235 }
2236
2237 /**
2238  * Handle the assume optimizer hint.
2239  *
2240  * @param dbi    debug info
2241  * @param expr   the IL assume expression
2242  */
2243 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2244 {
2245         switch(expression->kind) {
2246         case EXPR_BINARY_EQUAL:
2247         case EXPR_BINARY_NOTEQUAL:
2248         case EXPR_BINARY_LESS:
2249         case EXPR_BINARY_LESSEQUAL:
2250         case EXPR_BINARY_GREATER:
2251         case EXPR_BINARY_GREATEREQUAL:
2252                 return handle_assume_compare(dbi, &expression->binary);
2253         default:
2254                 return NULL;
2255         }
2256 }
2257
2258 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2259                             type_t *from_type, type_t *type)
2260 {
2261         type = skip_typeref(type);
2262         if (is_type_void(type)) {
2263                 /* make sure firm type is constructed */
2264                 (void) get_ir_type(type);
2265                 return NULL;
2266         }
2267         if (!is_type_scalar(type)) {
2268                 /* make sure firm type is constructed */
2269                 (void) get_ir_type(type);
2270                 return value_node;
2271         }
2272
2273         from_type     = skip_typeref(from_type);
2274         ir_mode *mode = get_ir_mode_storage(type);
2275         /* check for conversion from / to __based types */
2276         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2277                 const variable_t *from_var = from_type->pointer.base_variable;
2278                 const variable_t *to_var   = type->pointer.base_variable;
2279                 if (from_var != to_var) {
2280                         if (from_var != NULL) {
2281                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2282                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2283                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2284                         }
2285                         if (to_var != NULL) {
2286                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2287                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2288                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2289                         }
2290                 }
2291         }
2292
2293         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2294                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2295                  * convert to mode_b so we only get a 0/1 value */
2296                 value_node = create_conv(dbgi, value_node, mode_b);
2297         }
2298
2299         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2300         ir_node *node       = create_conv(dbgi, value_node, mode);
2301         node                = do_strict_conv(dbgi, node);
2302         node                = create_conv(dbgi, node, mode_arith);
2303
2304         return node;
2305 }
2306
2307 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2308 {
2309         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2310         type_t   *type = skip_typeref(expression->base.type);
2311
2312         const expression_t *value = expression->value;
2313
2314         switch(expression->base.kind) {
2315         case EXPR_UNARY_TAKE_ADDRESS:
2316                 return expression_to_addr(value);
2317
2318         case EXPR_UNARY_NEGATE: {
2319                 ir_node *value_node = expression_to_firm(value);
2320                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2321                 return new_d_Minus(dbgi, value_node, mode);
2322         }
2323         case EXPR_UNARY_PLUS:
2324                 return expression_to_firm(value);
2325         case EXPR_UNARY_BITWISE_NEGATE: {
2326                 ir_node *value_node = expression_to_firm(value);
2327                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2328                 return new_d_Not(dbgi, value_node, mode);
2329         }
2330         case EXPR_UNARY_NOT: {
2331                 ir_node *value_node = _expression_to_firm(value);
2332                 value_node          = create_conv(dbgi, value_node, mode_b);
2333                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2334                 return res;
2335         }
2336         case EXPR_UNARY_DEREFERENCE: {
2337                 ir_node *value_node = expression_to_firm(value);
2338                 type_t  *value_type = skip_typeref(value->base.type);
2339                 assert(is_type_pointer(value_type));
2340
2341                 /* check for __based */
2342                 const variable_t *const base_var = value_type->pointer.base_variable;
2343                 if (base_var != NULL) {
2344                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2345                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2346                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2347                 }
2348                 type_t  *points_to  = value_type->pointer.points_to;
2349                 return deref_address(dbgi, points_to, value_node);
2350         }
2351         case EXPR_UNARY_POSTFIX_INCREMENT:
2352         case EXPR_UNARY_POSTFIX_DECREMENT:
2353         case EXPR_UNARY_PREFIX_INCREMENT:
2354         case EXPR_UNARY_PREFIX_DECREMENT:
2355                 return create_incdec(expression);
2356         case EXPR_UNARY_CAST: {
2357                 ir_node *value_node = expression_to_firm(value);
2358                 type_t  *from_type  = value->base.type;
2359                 return create_cast(dbgi, value_node, from_type, type);
2360         }
2361         case EXPR_UNARY_ASSUME:
2362                 return handle_assume(dbgi, value);
2363
2364         default:
2365                 break;
2366         }
2367         panic("invalid UNEXPR type found");
2368 }
2369
2370 /**
2371  * produces a 0/1 depending of the value of a mode_b node
2372  */
2373 static ir_node *produce_condition_result(const expression_t *expression,
2374                                          ir_mode *mode, dbg_info *dbgi)
2375 {
2376         ir_node *const one_block  = new_immBlock();
2377         ir_node *const zero_block = new_immBlock();
2378         create_condition_evaluation(expression, one_block, zero_block);
2379         mature_immBlock(one_block);
2380         mature_immBlock(zero_block);
2381
2382         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2383         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2384         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2385         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2386         set_cur_block(block);
2387
2388         ir_node *const one   = new_Const(get_mode_one(mode));
2389         ir_node *const zero  = new_Const(get_mode_null(mode));
2390         ir_node *const in[2] = { one, zero };
2391         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2392
2393         return val;
2394 }
2395
2396 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2397                 ir_node *value, type_t *type)
2398 {
2399         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2400         assert(is_type_pointer(type));
2401         pointer_type_t *const pointer_type = &type->pointer;
2402         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2403         ir_node        *      elem_size    = get_type_size_node(points_to);
2404         elem_size                          = create_conv(dbgi, elem_size, mode);
2405         value                              = create_conv(dbgi, value,     mode);
2406         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2407         return mul;
2408 }
2409
2410 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2411                           ir_node *left, ir_node *right)
2412 {
2413         ir_mode  *mode;
2414         type_t   *type_left  = skip_typeref(expression->left->base.type);
2415         type_t   *type_right = skip_typeref(expression->right->base.type);
2416
2417         expression_kind_t kind = expression->base.kind;
2418
2419         switch (kind) {
2420         case EXPR_BINARY_SHIFTLEFT:
2421         case EXPR_BINARY_SHIFTRIGHT:
2422         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2423         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2424                 mode  = get_ir_mode_arithmetic(expression->base.type);
2425                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2426                 break;
2427
2428         case EXPR_BINARY_SUB:
2429                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2430                         const pointer_type_t *const ptr_type = &type_left->pointer;
2431
2432                         mode = get_ir_mode_arithmetic(expression->base.type);
2433                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2434                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2435                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2436                         ir_node *const no_mem    = new_NoMem();
2437                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2438                                                                                                    mode, op_pin_state_floats);
2439                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2440                 }
2441                 /* fallthrough */
2442         case EXPR_BINARY_SUB_ASSIGN:
2443                 if (is_type_pointer(type_left)) {
2444                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2445                         mode  = get_ir_mode_arithmetic(type_left);
2446                         break;
2447                 }
2448                 goto normal_node;
2449
2450         case EXPR_BINARY_ADD:
2451         case EXPR_BINARY_ADD_ASSIGN:
2452                 if (is_type_pointer(type_left)) {
2453                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2454                         mode  = get_ir_mode_arithmetic(type_left);
2455                         break;
2456                 } else if (is_type_pointer(type_right)) {
2457                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2458                         mode  = get_ir_mode_arithmetic(type_right);
2459                         break;
2460                 }
2461                 goto normal_node;
2462
2463         default:
2464 normal_node:
2465                 mode = get_ir_mode_arithmetic(type_right);
2466                 left = create_conv(dbgi, left, mode);
2467                 break;
2468         }
2469
2470         switch (kind) {
2471         case EXPR_BINARY_ADD_ASSIGN:
2472         case EXPR_BINARY_ADD:
2473                 return new_d_Add(dbgi, left, right, mode);
2474         case EXPR_BINARY_SUB_ASSIGN:
2475         case EXPR_BINARY_SUB:
2476                 return new_d_Sub(dbgi, left, right, mode);
2477         case EXPR_BINARY_MUL_ASSIGN:
2478         case EXPR_BINARY_MUL:
2479                 return new_d_Mul(dbgi, left, right, mode);
2480         case EXPR_BINARY_BITWISE_AND:
2481         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2482                 return new_d_And(dbgi, left, right, mode);
2483         case EXPR_BINARY_BITWISE_OR:
2484         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2485                 return new_d_Or(dbgi, left, right, mode);
2486         case EXPR_BINARY_BITWISE_XOR:
2487         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2488                 return new_d_Eor(dbgi, left, right, mode);
2489         case EXPR_BINARY_SHIFTLEFT:
2490         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2491                 return new_d_Shl(dbgi, left, right, mode);
2492         case EXPR_BINARY_SHIFTRIGHT:
2493         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2494                 if (mode_is_signed(mode)) {
2495                         return new_d_Shrs(dbgi, left, right, mode);
2496                 } else {
2497                         return new_d_Shr(dbgi, left, right, mode);
2498                 }
2499         case EXPR_BINARY_DIV:
2500         case EXPR_BINARY_DIV_ASSIGN: {
2501                 ir_node *pin = new_Pin(new_NoMem());
2502                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2503                                          op_pin_state_floats);
2504                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2505                 return res;
2506         }
2507         case EXPR_BINARY_MOD:
2508         case EXPR_BINARY_MOD_ASSIGN: {
2509                 ir_node *pin = new_Pin(new_NoMem());
2510                 assert(!mode_is_float(mode));
2511                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2512                                          op_pin_state_floats);
2513                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2514                 return res;
2515         }
2516         default:
2517                 panic("unexpected expression kind");
2518         }
2519 }
2520
2521 static ir_node *create_lazy_op(const binary_expression_t *expression)
2522 {
2523         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2524         type_t   *type = skip_typeref(expression->base.type);
2525         ir_mode  *mode = get_ir_mode_arithmetic(type);
2526
2527         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2528                 bool val = fold_constant_to_bool(expression->left);
2529                 expression_kind_t ekind = expression->base.kind;
2530                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2531                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2532                         if (!val) {
2533                                 return new_Const(get_mode_null(mode));
2534                         }
2535                 } else {
2536                         if (val) {
2537                                 return new_Const(get_mode_one(mode));
2538                         }
2539                 }
2540
2541                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2542                         bool valr = fold_constant_to_bool(expression->right);
2543                         return create_Const_from_bool(mode, valr);
2544                 }
2545
2546                 return produce_condition_result(expression->right, mode, dbgi);
2547         }
2548
2549         return produce_condition_result((const expression_t*) expression, mode,
2550                                         dbgi);
2551 }
2552
2553 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2554                                             ir_node *right, ir_mode *mode);
2555
2556 static ir_node *create_assign_binop(const binary_expression_t *expression)
2557 {
2558         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2559         const expression_t *left_expr = expression->left;
2560         type_t             *type      = skip_typeref(left_expr->base.type);
2561         ir_node            *right     = expression_to_firm(expression->right);
2562         ir_node            *left_addr = expression_to_addr(left_expr);
2563         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2564         ir_node            *result    = create_op(dbgi, expression, left, right);
2565
2566         result = create_cast(dbgi, result, expression->right->base.type, type);
2567         result = do_strict_conv(dbgi, result);
2568
2569         result = set_value_for_expression_addr(left_expr, result, left_addr);
2570
2571         if (!is_type_compound(type)) {
2572                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2573                 result = create_conv(dbgi, result, mode_arithmetic);
2574         }
2575         return result;
2576 }
2577
2578 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2579 {
2580         expression_kind_t kind = expression->base.kind;
2581
2582         switch(kind) {
2583         case EXPR_BINARY_EQUAL:
2584         case EXPR_BINARY_NOTEQUAL:
2585         case EXPR_BINARY_LESS:
2586         case EXPR_BINARY_LESSEQUAL:
2587         case EXPR_BINARY_GREATER:
2588         case EXPR_BINARY_GREATEREQUAL:
2589         case EXPR_BINARY_ISGREATER:
2590         case EXPR_BINARY_ISGREATEREQUAL:
2591         case EXPR_BINARY_ISLESS:
2592         case EXPR_BINARY_ISLESSEQUAL:
2593         case EXPR_BINARY_ISLESSGREATER:
2594         case EXPR_BINARY_ISUNORDERED: {
2595                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2596                 ir_node    *left     = expression_to_firm(expression->left);
2597                 ir_node    *right    = expression_to_firm(expression->right);
2598                 ir_relation relation = get_relation(kind);
2599                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2600                 return cmp;
2601         }
2602         case EXPR_BINARY_ASSIGN: {
2603                 ir_node *addr  = expression_to_addr(expression->left);
2604                 ir_node *right = expression_to_firm(expression->right);
2605                 ir_node *res
2606                         = set_value_for_expression_addr(expression->left, right, addr);
2607
2608                 type_t  *type            = skip_typeref(expression->base.type);
2609                 if (!is_type_compound(type)) {
2610                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2611                         res                      = create_conv(NULL, res, mode_arithmetic);
2612                 }
2613                 return res;
2614         }
2615         case EXPR_BINARY_ADD:
2616         case EXPR_BINARY_SUB:
2617         case EXPR_BINARY_MUL:
2618         case EXPR_BINARY_DIV:
2619         case EXPR_BINARY_MOD:
2620         case EXPR_BINARY_BITWISE_AND:
2621         case EXPR_BINARY_BITWISE_OR:
2622         case EXPR_BINARY_BITWISE_XOR:
2623         case EXPR_BINARY_SHIFTLEFT:
2624         case EXPR_BINARY_SHIFTRIGHT:
2625         {
2626                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2627                 ir_node  *left  = expression_to_firm(expression->left);
2628                 ir_node  *right = expression_to_firm(expression->right);
2629                 return create_op(dbgi, expression, left, right);
2630         }
2631         case EXPR_BINARY_LOGICAL_AND:
2632         case EXPR_BINARY_LOGICAL_OR:
2633                 return create_lazy_op(expression);
2634         case EXPR_BINARY_COMMA:
2635                 /* create side effects of left side */
2636                 (void) expression_to_firm(expression->left);
2637                 return _expression_to_firm(expression->right);
2638
2639         case EXPR_BINARY_ADD_ASSIGN:
2640         case EXPR_BINARY_SUB_ASSIGN:
2641         case EXPR_BINARY_MUL_ASSIGN:
2642         case EXPR_BINARY_MOD_ASSIGN:
2643         case EXPR_BINARY_DIV_ASSIGN:
2644         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2645         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2646         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2647         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2648         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2649                 return create_assign_binop(expression);
2650         default:
2651                 panic("TODO binexpr type");
2652         }
2653 }
2654
2655 static ir_node *array_access_addr(const array_access_expression_t *expression)
2656 {
2657         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2658         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2659         ir_node  *offset      = expression_to_firm(expression->index);
2660         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2661         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2662         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2663
2664         return result;
2665 }
2666
2667 static ir_node *array_access_to_firm(
2668                 const array_access_expression_t *expression)
2669 {
2670         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2671         ir_node  *addr   = array_access_addr(expression);
2672         type_t   *type   = revert_automatic_type_conversion(
2673                         (const expression_t*) expression);
2674         type             = skip_typeref(type);
2675
2676         return deref_address(dbgi, type, addr);
2677 }
2678
2679 static long get_offsetof_offset(const offsetof_expression_t *expression)
2680 {
2681         type_t *orig_type = expression->type;
2682         long    offset    = 0;
2683
2684         designator_t *designator = expression->designator;
2685         for ( ; designator != NULL; designator = designator->next) {
2686                 type_t *type = skip_typeref(orig_type);
2687                 /* be sure the type is constructed */
2688                 (void) get_ir_type(type);
2689
2690                 if (designator->symbol != NULL) {
2691                         assert(is_type_compound(type));
2692                         symbol_t *symbol = designator->symbol;
2693
2694                         compound_t *compound = type->compound.compound;
2695                         entity_t   *iter     = compound->members.entities;
2696                         for ( ; iter != NULL; iter = iter->base.next) {
2697                                 if (iter->base.symbol == symbol) {
2698                                         break;
2699                                 }
2700                         }
2701                         assert(iter != NULL);
2702
2703                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2704                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2705                         offset += get_entity_offset(iter->compound_member.entity);
2706
2707                         orig_type = iter->declaration.type;
2708                 } else {
2709                         expression_t *array_index = designator->array_index;
2710                         assert(designator->array_index != NULL);
2711                         assert(is_type_array(type));
2712
2713                         long index         = fold_constant_to_int(array_index);
2714                         ir_type *arr_type  = get_ir_type(type);
2715                         ir_type *elem_type = get_array_element_type(arr_type);
2716                         long     elem_size = get_type_size_bytes(elem_type);
2717
2718                         offset += index * elem_size;
2719
2720                         orig_type = type->array.element_type;
2721                 }
2722         }
2723
2724         return offset;
2725 }
2726
2727 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2728 {
2729         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2730         long       offset = get_offsetof_offset(expression);
2731         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2732         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2733
2734         return new_d_Const(dbgi, tv);
2735 }
2736
2737 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2738                                      ir_entity *entity, type_t *type);
2739 static ir_initializer_t *create_ir_initializer(
2740                 const initializer_t *initializer, type_t *type);
2741
2742 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2743                                             initializer_t *initializer,
2744                                             type_t *type)
2745 {
2746         /* create the ir_initializer */
2747         ir_graph *const old_current_ir_graph = current_ir_graph;
2748         current_ir_graph = get_const_code_irg();
2749
2750         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2751
2752         assert(current_ir_graph == get_const_code_irg());
2753         current_ir_graph = old_current_ir_graph;
2754
2755         ident     *const id          = id_unique("initializer.%u");
2756         ir_type   *const irtype      = get_ir_type(type);
2757         ir_type   *const global_type = get_glob_type();
2758         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2759         set_entity_ld_ident(entity, id);
2760         set_entity_visibility(entity, ir_visibility_private);
2761         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2762         set_entity_initializer(entity, irinitializer);
2763         return entity;
2764 }
2765
2766 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2767 {
2768         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2769         type_t        *type        = expression->type;
2770         initializer_t *initializer = expression->initializer;
2771
2772         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2773                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2774                 return create_symconst(dbgi, entity);
2775         } else {
2776                 /* create an entity on the stack */
2777                 ident   *const id     = id_unique("CompLit.%u");
2778                 ir_type *const irtype = get_ir_type(type);
2779                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2780
2781                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2782                 set_entity_ld_ident(entity, id);
2783
2784                 /* create initialisation code */
2785                 create_local_initializer(initializer, dbgi, entity, type);
2786
2787                 /* create a sel for the compound literal address */
2788                 ir_node *frame = get_irg_frame(current_ir_graph);
2789                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2790                 return sel;
2791         }
2792 }
2793
2794 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2795 {
2796         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2797         type_t   *const type = expr->type;
2798         ir_node  *const addr = compound_literal_addr(expr);
2799         return deref_address(dbgi, type, addr);
2800 }
2801
2802 /**
2803  * Transform a sizeof expression into Firm code.
2804  */
2805 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2806 {
2807         type_t *const type = skip_typeref(expression->type);
2808         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2809         if (is_type_array(type) && type->array.is_vla
2810                         && expression->tp_expression != NULL) {
2811                 expression_to_firm(expression->tp_expression);
2812         }
2813
2814         return get_type_size_node(type);
2815 }
2816
2817 static entity_t *get_expression_entity(const expression_t *expression)
2818 {
2819         if (expression->kind != EXPR_REFERENCE)
2820                 return NULL;
2821
2822         return expression->reference.entity;
2823 }
2824
2825 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2826 {
2827         switch(entity->kind) {
2828         case DECLARATION_KIND_CASES:
2829                 return entity->declaration.alignment;
2830         case ENTITY_STRUCT:
2831         case ENTITY_UNION:
2832                 return entity->compound.alignment;
2833         case ENTITY_TYPEDEF:
2834                 return entity->typedefe.alignment;
2835         default:
2836                 break;
2837         }
2838         return 0;
2839 }
2840
2841 /**
2842  * Transform an alignof expression into Firm code.
2843  */
2844 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2845 {
2846         unsigned alignment = 0;
2847
2848         const expression_t *tp_expression = expression->tp_expression;
2849         if (tp_expression != NULL) {
2850                 entity_t *entity = get_expression_entity(tp_expression);
2851                 if (entity != NULL) {
2852                         alignment = get_cparser_entity_alignment(entity);
2853                 }
2854         }
2855
2856         if (alignment == 0) {
2857                 type_t *type = expression->type;
2858                 alignment = get_type_alignment(type);
2859         }
2860
2861         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2862         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2863         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2864         return new_d_Const(dbgi, tv);
2865 }
2866
2867 static void init_ir_types(void);
2868
2869 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2870 {
2871         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2872
2873         bool constant_folding_old = constant_folding;
2874         constant_folding = true;
2875         int old_optimize         = get_optimize();
2876         int old_constant_folding = get_opt_constant_folding();
2877         set_optimize(1);
2878         set_opt_constant_folding(1);
2879
2880         init_ir_types();
2881
2882         ir_graph *old_current_ir_graph = current_ir_graph;
2883         current_ir_graph = get_const_code_irg();
2884
2885         ir_node *const cnst = _expression_to_firm(expression);
2886
2887         current_ir_graph = old_current_ir_graph;
2888         set_optimize(old_optimize);
2889         set_opt_constant_folding(old_constant_folding);
2890
2891         if (!is_Const(cnst)) {
2892                 panic("couldn't fold constant");
2893         }
2894
2895         constant_folding = constant_folding_old;
2896
2897         ir_tarval *const tv   = get_Const_tarval(cnst);
2898         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2899         return tarval_convert_to(tv, mode);
2900 }
2901
2902 /* this function is only used in parser.c, but it relies on libfirm functionality */
2903 bool constant_is_negative(const expression_t *expression)
2904 {
2905         ir_tarval *tv = fold_constant_to_tarval(expression);
2906         return tarval_is_negative(tv);
2907 }
2908
2909 long fold_constant_to_int(const expression_t *expression)
2910 {
2911         ir_tarval *tv = fold_constant_to_tarval(expression);
2912         if (!tarval_is_long(tv)) {
2913                 panic("result of constant folding is not integer");
2914         }
2915
2916         return get_tarval_long(tv);
2917 }
2918
2919 bool fold_constant_to_bool(const expression_t *expression)
2920 {
2921         ir_tarval *tv = fold_constant_to_tarval(expression);
2922         return !tarval_is_null(tv);
2923 }
2924
2925 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2926 {
2927         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2928
2929         /* first try to fold a constant condition */
2930         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2931                 bool val = fold_constant_to_bool(expression->condition);
2932                 if (val) {
2933                         expression_t *true_expression = expression->true_expression;
2934                         if (true_expression == NULL)
2935                                 true_expression = expression->condition;
2936                         return expression_to_firm(true_expression);
2937                 } else {
2938                         return expression_to_firm(expression->false_expression);
2939                 }
2940         }
2941
2942         ir_node *const true_block  = new_immBlock();
2943         ir_node *const false_block = new_immBlock();
2944         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
2945         mature_immBlock(true_block);
2946         mature_immBlock(false_block);
2947
2948         set_cur_block(true_block);
2949         ir_node *true_val;
2950         if (expression->true_expression != NULL) {
2951                 true_val = expression_to_firm(expression->true_expression);
2952         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
2953                 true_val = cond_expr;
2954         } else {
2955                 /* Condition ended with a short circuit (&&, ||, !) operation or a
2956                  * comparison.  Generate a "1" as value for the true branch. */
2957                 true_val = new_Const(get_mode_one(mode_Is));
2958         }
2959         ir_node *const true_jmp = new_d_Jmp(dbgi);
2960
2961         set_cur_block(false_block);
2962         ir_node *const false_val = expression_to_firm(expression->false_expression);
2963         ir_node *const false_jmp = new_d_Jmp(dbgi);
2964
2965         /* create the common block */
2966         ir_node *const in_cf[2] = { true_jmp, false_jmp };
2967         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2968         set_cur_block(block);
2969
2970         /* TODO improve static semantics, so either both or no values are NULL */
2971         if (true_val == NULL || false_val == NULL)
2972                 return NULL;
2973
2974         ir_node *const in[2] = { true_val, false_val };
2975         type_t  *const type  = skip_typeref(expression->base.type);
2976         ir_mode *const mode  = get_ir_mode_arithmetic(type);
2977         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2978
2979         return val;
2980 }
2981
2982 /**
2983  * Returns an IR-node representing the address of a field.
2984  */
2985 static ir_node *select_addr(const select_expression_t *expression)
2986 {
2987         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2988
2989         construct_select_compound(expression);
2990
2991         ir_node *compound_addr = expression_to_firm(expression->compound);
2992
2993         entity_t *entry = expression->compound_entry;
2994         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2995         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2996
2997         if (constant_folding) {
2998                 ir_mode *mode      = get_irn_mode(compound_addr);
2999                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3000                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3001                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3002         } else {
3003                 ir_entity *irentity = entry->compound_member.entity;
3004                 assert(irentity != NULL);
3005                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3006         }
3007 }
3008
3009 static ir_node *select_to_firm(const select_expression_t *expression)
3010 {
3011         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3012         ir_node  *addr = select_addr(expression);
3013         type_t   *type = revert_automatic_type_conversion(
3014                         (const expression_t*) expression);
3015         type           = skip_typeref(type);
3016
3017         entity_t *entry = expression->compound_entry;
3018         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3019
3020         if (entry->compound_member.bitfield) {
3021                 return bitfield_extract_to_firm(expression, addr);
3022         }
3023
3024         return deref_address(dbgi, type, addr);
3025 }
3026
3027 /* Values returned by __builtin_classify_type. */
3028 typedef enum gcc_type_class
3029 {
3030         no_type_class = -1,
3031         void_type_class,
3032         integer_type_class,
3033         char_type_class,
3034         enumeral_type_class,
3035         boolean_type_class,
3036         pointer_type_class,
3037         reference_type_class,
3038         offset_type_class,
3039         real_type_class,
3040         complex_type_class,
3041         function_type_class,
3042         method_type_class,
3043         record_type_class,
3044         union_type_class,
3045         array_type_class,
3046         string_type_class,
3047         set_type_class,
3048         file_type_class,
3049         lang_type_class
3050 } gcc_type_class;
3051
3052 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3053 {
3054         type_t *type = expr->type_expression->base.type;
3055
3056         /* FIXME gcc returns different values depending on whether compiling C or C++
3057          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3058         gcc_type_class tc;
3059         for (;;) {
3060                 type = skip_typeref(type);
3061                 switch (type->kind) {
3062                         case TYPE_ATOMIC: {
3063                                 const atomic_type_t *const atomic_type = &type->atomic;
3064                                 switch (atomic_type->akind) {
3065                                         /* should not be reached */
3066                                         case ATOMIC_TYPE_INVALID:
3067                                                 tc = no_type_class;
3068                                                 goto make_const;
3069
3070                                         /* gcc cannot do that */
3071                                         case ATOMIC_TYPE_VOID:
3072                                                 tc = void_type_class;
3073                                                 goto make_const;
3074
3075                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3076                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3077                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3078                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3079                                         case ATOMIC_TYPE_SHORT:
3080                                         case ATOMIC_TYPE_USHORT:
3081                                         case ATOMIC_TYPE_INT:
3082                                         case ATOMIC_TYPE_UINT:
3083                                         case ATOMIC_TYPE_LONG:
3084                                         case ATOMIC_TYPE_ULONG:
3085                                         case ATOMIC_TYPE_LONGLONG:
3086                                         case ATOMIC_TYPE_ULONGLONG:
3087                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3088                                                 tc = integer_type_class;
3089                                                 goto make_const;
3090
3091                                         case ATOMIC_TYPE_FLOAT:
3092                                         case ATOMIC_TYPE_DOUBLE:
3093                                         case ATOMIC_TYPE_LONG_DOUBLE:
3094                                                 tc = real_type_class;
3095                                                 goto make_const;
3096                                 }
3097                                 panic("Unexpected atomic type in classify_type_to_firm().");
3098                         }
3099
3100                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3101                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3102                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3103                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3104                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3105                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3106                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3107
3108                         /* gcc handles this as integer */
3109                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3110
3111                         /* gcc classifies the referenced type */
3112                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3113
3114                         /* typedef/typeof should be skipped already */
3115                         case TYPE_TYPEDEF:
3116                         case TYPE_TYPEOF:
3117                         case TYPE_ERROR:
3118                                 break;
3119                 }
3120                 panic("unexpected TYPE classify_type_to_firm().");
3121         }
3122
3123 make_const:;
3124         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3125         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3126         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3127         return new_d_Const(dbgi, tv);
3128 }
3129
3130 static ir_node *function_name_to_firm(
3131                 const funcname_expression_t *const expr)
3132 {
3133         switch(expr->kind) {
3134         case FUNCNAME_FUNCTION:
3135         case FUNCNAME_PRETTY_FUNCTION:
3136         case FUNCNAME_FUNCDNAME:
3137                 if (current_function_name == NULL) {
3138                         const source_position_t *const src_pos = &expr->base.source_position;
3139                         const char    *name  = current_function_entity->base.symbol->string;
3140                         const string_t string = { name, strlen(name) };
3141                         current_function_name = string_to_firm(src_pos, "__func__.%u", STRING_ENCODING_CHAR, &string);
3142                 }
3143                 return current_function_name;
3144         case FUNCNAME_FUNCSIG:
3145                 if (current_funcsig == NULL) {
3146                         const source_position_t *const src_pos = &expr->base.source_position;
3147                         ir_entity *ent = get_irg_entity(current_ir_graph);
3148                         const char *const name = get_entity_ld_name(ent);
3149                         const string_t string = { name, strlen(name) };
3150                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", STRING_ENCODING_CHAR, &string);
3151                 }
3152                 return current_funcsig;
3153         }
3154         panic("Unsupported function name");
3155 }
3156
3157 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3158 {
3159         statement_t *statement = expr->statement;
3160
3161         assert(statement->kind == STATEMENT_COMPOUND);
3162         return compound_statement_to_firm(&statement->compound);
3163 }
3164
3165 static ir_node *va_start_expression_to_firm(
3166         const va_start_expression_t *const expr)
3167 {
3168         ir_entity *param_ent = current_vararg_entity;
3169         if (param_ent == NULL) {
3170                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3171                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3172                 ir_type *const param_type  = get_unknown_type();
3173                 param_ent = new_parameter_entity(frame_type, n, param_type);
3174                 current_vararg_entity = param_ent;
3175         }
3176
3177         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3178         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3179         ir_node  *const no_mem  = new_NoMem();
3180         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3181
3182         set_value_for_expression(expr->ap, arg_sel);
3183
3184         return NULL;
3185 }
3186
3187 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3188 {
3189         type_t       *const type    = expr->base.type;
3190         expression_t *const ap_expr = expr->ap;
3191         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3192         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3193         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3194         ir_node      *const res     = deref_address(dbgi, type, ap);
3195
3196         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3197         ir_mode      *const mode    = get_irn_mode(cnst);
3198         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3199         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3200         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3201         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3202         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3203
3204         set_value_for_expression_addr(ap_expr, add, ap_addr);
3205
3206         return res;
3207 }
3208
3209 /**
3210  * Generate Firm for a va_copy expression.
3211  */
3212 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3213 {
3214         ir_node *const src = expression_to_firm(expr->src);
3215         set_value_for_expression(expr->dst, src);
3216         return NULL;
3217 }
3218
3219 static ir_node *dereference_addr(const unary_expression_t *const expression)
3220 {
3221         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3222         return expression_to_firm(expression->value);
3223 }
3224
3225 /**
3226  * Returns a IR-node representing an lvalue of the given expression.
3227  */
3228 static ir_node *expression_to_addr(const expression_t *expression)
3229 {
3230         switch(expression->kind) {
3231         case EXPR_ARRAY_ACCESS:
3232                 return array_access_addr(&expression->array_access);
3233         case EXPR_CALL:
3234                 return call_expression_to_firm(&expression->call);
3235         case EXPR_COMPOUND_LITERAL:
3236                 return compound_literal_addr(&expression->compound_literal);
3237         case EXPR_REFERENCE:
3238                 return reference_addr(&expression->reference);
3239         case EXPR_SELECT:
3240                 return select_addr(&expression->select);
3241         case EXPR_UNARY_DEREFERENCE:
3242                 return dereference_addr(&expression->unary);
3243         default:
3244                 break;
3245         }
3246         panic("trying to get address of non-lvalue");
3247 }
3248
3249 static ir_node *builtin_constant_to_firm(
3250                 const builtin_constant_expression_t *expression)
3251 {
3252         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3253         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3254         return create_Const_from_bool(mode, v);
3255 }
3256
3257 static ir_node *builtin_types_compatible_to_firm(
3258                 const builtin_types_compatible_expression_t *expression)
3259 {
3260         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3261         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3262         bool     const value = types_compatible(left, right);
3263         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3264         return create_Const_from_bool(mode, value);
3265 }
3266
3267 static ir_node *get_label_block(label_t *label)
3268 {
3269         if (label->block != NULL)
3270                 return label->block;
3271
3272         /* beware: might be called from create initializer with current_ir_graph
3273          * set to const_code_irg. */
3274         ir_graph *rem    = current_ir_graph;
3275         current_ir_graph = current_function;
3276
3277         ir_node *block = new_immBlock();
3278
3279         label->block = block;
3280
3281         ARR_APP1(label_t *, all_labels, label);
3282
3283         current_ir_graph = rem;
3284         return block;
3285 }
3286
3287 /**
3288  * Pointer to a label.  This is used for the
3289  * GNU address-of-label extension.
3290  */
3291 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3292 {
3293         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3294         ir_node   *block  = get_label_block(label->label);
3295         ir_entity *entity = create_Block_entity(block);
3296
3297         symconst_symbol value;
3298         value.entity_p = entity;
3299         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3300 }
3301
3302 /**
3303  * creates firm nodes for an expression. The difference between this function
3304  * and expression_to_firm is, that this version might produce mode_b nodes
3305  * instead of mode_Is.
3306  */
3307 static ir_node *_expression_to_firm(expression_t const *const expr)
3308 {
3309 #ifndef NDEBUG
3310         if (!constant_folding) {
3311                 assert(!expr->base.transformed);
3312                 ((expression_t*)expr)->base.transformed = true;
3313         }
3314 #endif
3315
3316         switch (expr->kind) {
3317         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3318         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3319         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3320         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3321         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3322         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3323         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3324         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3325         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3326         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3327         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3328         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3329         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3330         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3331         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3332         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3333         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3334         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3335         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3336         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3337         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3338         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3339
3340         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", expr->string_literal.encoding, &expr->string_literal.value);
3341
3342         case EXPR_ERROR: break;
3343         }
3344         panic("invalid expression found");
3345 }
3346
3347 /**
3348  * Check if a given expression is a GNU __builtin_expect() call.
3349  */
3350 static bool is_builtin_expect(const expression_t *expression)
3351 {
3352         if (expression->kind != EXPR_CALL)
3353                 return false;
3354
3355         expression_t *function = expression->call.function;
3356         if (function->kind != EXPR_REFERENCE)
3357                 return false;
3358         reference_expression_t *ref = &function->reference;
3359         if (ref->entity->kind         != ENTITY_FUNCTION ||
3360             ref->entity->function.btk != BUILTIN_EXPECT)
3361                 return false;
3362
3363         return true;
3364 }
3365
3366 static bool produces_mode_b(const expression_t *expression)
3367 {
3368         switch (expression->kind) {
3369         case EXPR_BINARY_EQUAL:
3370         case EXPR_BINARY_NOTEQUAL:
3371         case EXPR_BINARY_LESS:
3372         case EXPR_BINARY_LESSEQUAL:
3373         case EXPR_BINARY_GREATER:
3374         case EXPR_BINARY_GREATEREQUAL:
3375         case EXPR_BINARY_ISGREATER:
3376         case EXPR_BINARY_ISGREATEREQUAL:
3377         case EXPR_BINARY_ISLESS:
3378         case EXPR_BINARY_ISLESSEQUAL:
3379         case EXPR_BINARY_ISLESSGREATER:
3380         case EXPR_BINARY_ISUNORDERED:
3381         case EXPR_UNARY_NOT:
3382                 return true;
3383
3384         case EXPR_CALL:
3385                 if (is_builtin_expect(expression)) {
3386                         expression_t *argument = expression->call.arguments->expression;
3387                         return produces_mode_b(argument);
3388                 }
3389                 return false;
3390         case EXPR_BINARY_COMMA:
3391                 return produces_mode_b(expression->binary.right);
3392
3393         default:
3394                 return false;
3395         }
3396 }
3397
3398 static ir_node *expression_to_firm(const expression_t *expression)
3399 {
3400         if (!produces_mode_b(expression)) {
3401                 ir_node *res = _expression_to_firm(expression);
3402                 assert(res == NULL || get_irn_mode(res) != mode_b);
3403                 return res;
3404         }
3405
3406         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3407                 return new_Const(fold_constant_to_tarval(expression));
3408         }
3409
3410         /* we have to produce a 0/1 from the mode_b expression */
3411         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3412         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3413         return produce_condition_result(expression, mode, dbgi);
3414 }
3415
3416 /**
3417  * create a short-circuit expression evaluation that tries to construct
3418  * efficient control flow structures for &&, || and ! expressions
3419  */
3420 static ir_node *create_condition_evaluation(const expression_t *expression,
3421                                             ir_node *true_block,
3422                                             ir_node *false_block)
3423 {
3424         switch(expression->kind) {
3425         case EXPR_UNARY_NOT: {
3426                 const unary_expression_t *unary_expression = &expression->unary;
3427                 create_condition_evaluation(unary_expression->value, false_block,
3428                                             true_block);
3429                 return NULL;
3430         }
3431         case EXPR_BINARY_LOGICAL_AND: {
3432                 const binary_expression_t *binary_expression = &expression->binary;
3433
3434                 ir_node *extra_block = new_immBlock();
3435                 create_condition_evaluation(binary_expression->left, extra_block,
3436                                             false_block);
3437                 mature_immBlock(extra_block);
3438                 set_cur_block(extra_block);
3439                 create_condition_evaluation(binary_expression->right, true_block,
3440                                             false_block);
3441                 return NULL;
3442         }
3443         case EXPR_BINARY_LOGICAL_OR: {
3444                 const binary_expression_t *binary_expression = &expression->binary;
3445
3446                 ir_node *extra_block = new_immBlock();
3447                 create_condition_evaluation(binary_expression->left, true_block,
3448                                             extra_block);
3449                 mature_immBlock(extra_block);
3450                 set_cur_block(extra_block);
3451                 create_condition_evaluation(binary_expression->right, true_block,
3452                                             false_block);
3453                 return NULL;
3454         }
3455         default:
3456                 break;
3457         }
3458
3459         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3460         ir_node  *cond_expr  = _expression_to_firm(expression);
3461         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3462         ir_node  *cond       = new_d_Cond(dbgi, condition);
3463         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3464         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3465
3466         /* set branch prediction info based on __builtin_expect */
3467         if (is_builtin_expect(expression) && is_Cond(cond)) {
3468                 call_argument_t *argument = expression->call.arguments->next;
3469                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3470                         bool               const cnst = fold_constant_to_bool(argument->expression);
3471                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3472                         set_Cond_jmp_pred(cond, pred);
3473                 }
3474         }
3475
3476         add_immBlock_pred(true_block, true_proj);
3477         add_immBlock_pred(false_block, false_proj);
3478
3479         set_unreachable_now();
3480         return cond_expr;
3481 }
3482
3483 static void create_variable_entity(entity_t *variable,
3484                                    declaration_kind_t declaration_kind,
3485                                    ir_type *parent_type)
3486 {
3487         assert(variable->kind == ENTITY_VARIABLE);
3488         type_t    *type = skip_typeref(variable->declaration.type);
3489
3490         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3491         ir_type   *const irtype    = get_ir_type(type);
3492         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3493         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3494         unsigned         alignment = variable->declaration.alignment;
3495
3496         set_entity_alignment(irentity, alignment);
3497
3498         handle_decl_modifiers(irentity, variable);
3499
3500         variable->declaration.kind  = (unsigned char) declaration_kind;
3501         variable->variable.v.entity = irentity;
3502         set_entity_ld_ident(irentity, create_ld_ident(variable));
3503
3504         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3505                 set_entity_volatility(irentity, volatility_is_volatile);
3506         }
3507 }
3508
3509
3510 typedef struct type_path_entry_t type_path_entry_t;
3511 struct type_path_entry_t {
3512         type_t           *type;
3513         ir_initializer_t *initializer;
3514         size_t            index;
3515         entity_t         *compound_entry;
3516 };
3517
3518 typedef struct type_path_t type_path_t;
3519 struct type_path_t {
3520         type_path_entry_t *path;
3521         type_t            *top_type;
3522         bool               invalid;
3523 };
3524
3525 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3526 {
3527         size_t len = ARR_LEN(path->path);
3528
3529         for (size_t i = 0; i < len; ++i) {
3530                 const type_path_entry_t *entry = & path->path[i];
3531
3532                 type_t *type = skip_typeref(entry->type);
3533                 if (is_type_compound(type)) {
3534                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3535                 } else if (is_type_array(type)) {
3536                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3537                 } else {
3538                         fprintf(stderr, "-INVALID-");
3539                 }
3540         }
3541         fprintf(stderr, "  (");
3542         print_type(path->top_type);
3543         fprintf(stderr, ")");
3544 }
3545
3546 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3547 {
3548         size_t len = ARR_LEN(path->path);
3549         assert(len > 0);
3550         return & path->path[len-1];
3551 }
3552
3553 static type_path_entry_t *append_to_type_path(type_path_t *path)
3554 {
3555         size_t len = ARR_LEN(path->path);
3556         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3557
3558         type_path_entry_t *result = & path->path[len];
3559         memset(result, 0, sizeof(result[0]));
3560         return result;
3561 }
3562
3563 static size_t get_compound_member_count(const compound_type_t *type)
3564 {
3565         compound_t *compound  = type->compound;
3566         size_t      n_members = 0;
3567         entity_t   *member    = compound->members.entities;
3568         for ( ; member != NULL; member = member->base.next) {
3569                 ++n_members;
3570         }
3571
3572         return n_members;
3573 }
3574
3575 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3576 {
3577         type_t *orig_top_type = path->top_type;
3578         type_t *top_type      = skip_typeref(orig_top_type);
3579
3580         assert(is_type_compound(top_type) || is_type_array(top_type));
3581
3582         if (ARR_LEN(path->path) == 0) {
3583                 return NULL;
3584         } else {
3585                 type_path_entry_t *top         = get_type_path_top(path);
3586                 ir_initializer_t  *initializer = top->initializer;
3587                 return get_initializer_compound_value(initializer, top->index);
3588         }
3589 }
3590
3591 static void descend_into_subtype(type_path_t *path)
3592 {
3593         type_t *orig_top_type = path->top_type;
3594         type_t *top_type      = skip_typeref(orig_top_type);
3595
3596         assert(is_type_compound(top_type) || is_type_array(top_type));
3597
3598         ir_initializer_t *initializer = get_initializer_entry(path);
3599
3600         type_path_entry_t *top = append_to_type_path(path);
3601         top->type              = top_type;
3602
3603         size_t len;
3604
3605         if (is_type_compound(top_type)) {
3606                 compound_t *const compound = top_type->compound.compound;
3607                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3608
3609                 top->compound_entry = entry;
3610                 top->index          = 0;
3611                 len                 = get_compound_member_count(&top_type->compound);
3612                 if (entry != NULL) {
3613                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3614                         path->top_type = entry->declaration.type;
3615                 }
3616         } else {
3617                 assert(is_type_array(top_type));
3618                 assert(top_type->array.size > 0);
3619
3620                 top->index     = 0;
3621                 path->top_type = top_type->array.element_type;
3622                 len            = top_type->array.size;
3623         }
3624         if (initializer == NULL
3625                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3626                 initializer = create_initializer_compound(len);
3627                 /* we have to set the entry at the 2nd latest path entry... */
3628                 size_t path_len = ARR_LEN(path->path);
3629                 assert(path_len >= 1);
3630                 if (path_len > 1) {
3631                         type_path_entry_t *entry        = & path->path[path_len-2];
3632                         ir_initializer_t  *tinitializer = entry->initializer;
3633                         set_initializer_compound_value(tinitializer, entry->index,
3634                                                        initializer);
3635                 }
3636         }
3637         top->initializer = initializer;
3638 }
3639
3640 static void ascend_from_subtype(type_path_t *path)
3641 {
3642         type_path_entry_t *top = get_type_path_top(path);
3643
3644         path->top_type = top->type;
3645
3646         size_t len = ARR_LEN(path->path);
3647         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3648 }
3649
3650 static void walk_designator(type_path_t *path, const designator_t *designator)
3651 {
3652         /* designators start at current object type */
3653         ARR_RESIZE(type_path_entry_t, path->path, 1);
3654
3655         for ( ; designator != NULL; designator = designator->next) {
3656                 type_path_entry_t *top         = get_type_path_top(path);
3657                 type_t            *orig_type   = top->type;
3658                 type_t            *type        = skip_typeref(orig_type);
3659
3660                 if (designator->symbol != NULL) {
3661                         assert(is_type_compound(type));
3662                         size_t    index  = 0;
3663                         symbol_t *symbol = designator->symbol;
3664
3665                         compound_t *compound = type->compound.compound;
3666                         entity_t   *iter     = compound->members.entities;
3667                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3668                                 if (iter->base.symbol == symbol) {
3669                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3670                                         break;
3671                                 }
3672                         }
3673                         assert(iter != NULL);
3674
3675                         /* revert previous initialisations of other union elements */
3676                         if (type->kind == TYPE_COMPOUND_UNION) {
3677                                 ir_initializer_t *initializer = top->initializer;
3678                                 if (initializer != NULL
3679                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3680                                         /* are we writing to a new element? */
3681                                         ir_initializer_t *oldi
3682                                                 = get_initializer_compound_value(initializer, index);
3683                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3684                                                 /* clear initializer */
3685                                                 size_t len
3686                                                         = get_initializer_compound_n_entries(initializer);
3687                                                 ir_initializer_t *nulli = get_initializer_null();
3688                                                 for (size_t i = 0; i < len; ++i) {
3689                                                         set_initializer_compound_value(initializer, i,
3690                                                                                        nulli);
3691                                                 }
3692                                         }
3693                                 }
3694                         }
3695
3696                         top->type           = orig_type;
3697                         top->compound_entry = iter;
3698                         top->index          = index;
3699                         orig_type           = iter->declaration.type;
3700                 } else {
3701                         expression_t *array_index = designator->array_index;
3702                         assert(designator->array_index != NULL);
3703                         assert(is_type_array(type));
3704
3705                         long index = fold_constant_to_int(array_index);
3706                         assert(index >= 0);
3707 #ifndef NDEBUG
3708                         if (type->array.size_constant) {
3709                                 long array_size = type->array.size;
3710                                 assert(index < array_size);
3711                         }
3712 #endif
3713
3714                         top->type  = orig_type;
3715                         top->index = (size_t) index;
3716                         orig_type  = type->array.element_type;
3717                 }
3718                 path->top_type = orig_type;
3719
3720                 if (designator->next != NULL) {
3721                         descend_into_subtype(path);
3722                 }
3723         }
3724
3725         path->invalid  = false;
3726 }
3727
3728 static void advance_current_object(type_path_t *path)
3729 {
3730         if (path->invalid) {
3731                 /* TODO: handle this... */
3732                 panic("invalid initializer in ast2firm (excessive elements)");
3733         }
3734
3735         type_path_entry_t *top = get_type_path_top(path);
3736
3737         type_t *type = skip_typeref(top->type);
3738         if (is_type_union(type)) {
3739                 /* only the first element is initialized in unions */
3740                 top->compound_entry = NULL;
3741         } else if (is_type_struct(type)) {
3742                 entity_t *entry = top->compound_entry;
3743
3744                 top->index++;
3745                 entry               = skip_unnamed_bitfields(entry->base.next);
3746                 top->compound_entry = entry;
3747                 if (entry != NULL) {
3748                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3749                         path->top_type = entry->declaration.type;
3750                         return;
3751                 }
3752         } else {
3753                 assert(is_type_array(type));
3754
3755                 top->index++;
3756                 if (!type->array.size_constant || top->index < type->array.size) {
3757                         return;
3758                 }
3759         }
3760
3761         /* we're past the last member of the current sub-aggregate, try if we
3762          * can ascend in the type hierarchy and continue with another subobject */
3763         size_t len = ARR_LEN(path->path);
3764
3765         if (len > 1) {
3766                 ascend_from_subtype(path);
3767                 advance_current_object(path);
3768         } else {
3769                 path->invalid = true;
3770         }
3771 }
3772
3773
3774 static ir_initializer_t *create_ir_initializer_value(
3775                 const initializer_value_t *initializer)
3776 {
3777         if (is_type_compound(initializer->value->base.type)) {
3778                 panic("initializer creation for compounds not implemented yet");
3779         }
3780         type_t       *type = initializer->value->base.type;
3781         expression_t *expr = initializer->value;
3782         ir_node *value = expression_to_firm(expr);
3783         ir_mode *mode  = get_ir_mode_storage(type);
3784         value          = create_conv(NULL, value, mode);
3785         return create_initializer_const(value);
3786 }
3787
3788 /** test wether type can be initialized by a string constant */
3789 static bool is_string_type(type_t *type)
3790 {
3791         type_t *inner;
3792         if (is_type_pointer(type)) {
3793                 inner = skip_typeref(type->pointer.points_to);
3794         } else if(is_type_array(type)) {
3795                 inner = skip_typeref(type->array.element_type);
3796         } else {
3797                 return false;
3798         }
3799
3800         return is_type_integer(inner);
3801 }
3802
3803 static ir_initializer_t *create_ir_initializer_list(
3804                 const initializer_list_t *initializer, type_t *type)
3805 {
3806         type_path_t path;
3807         memset(&path, 0, sizeof(path));
3808         path.top_type = type;
3809         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3810
3811         descend_into_subtype(&path);
3812
3813         for (size_t i = 0; i < initializer->len; ++i) {
3814                 const initializer_t *sub_initializer = initializer->initializers[i];
3815
3816                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3817                         walk_designator(&path, sub_initializer->designator.designator);
3818                         continue;
3819                 }
3820
3821                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3822                         /* we might have to descend into types until we're at a scalar
3823                          * type */
3824                         while(true) {
3825                                 type_t *orig_top_type = path.top_type;
3826                                 type_t *top_type      = skip_typeref(orig_top_type);
3827
3828                                 if (is_type_scalar(top_type))
3829                                         break;
3830                                 descend_into_subtype(&path);
3831                         }
3832                 } else if (sub_initializer->kind == INITIALIZER_STRING
3833                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3834                         /* we might have to descend into types until we're at a scalar
3835                          * type */
3836                         while (true) {
3837                                 type_t *orig_top_type = path.top_type;
3838                                 type_t *top_type      = skip_typeref(orig_top_type);
3839
3840                                 if (is_string_type(top_type))
3841                                         break;
3842                                 descend_into_subtype(&path);
3843                         }
3844                 }
3845
3846                 ir_initializer_t *sub_irinitializer
3847                         = create_ir_initializer(sub_initializer, path.top_type);
3848
3849                 size_t path_len = ARR_LEN(path.path);
3850                 assert(path_len >= 1);
3851                 type_path_entry_t *entry        = & path.path[path_len-1];
3852                 ir_initializer_t  *tinitializer = entry->initializer;
3853                 set_initializer_compound_value(tinitializer, entry->index,
3854                                                sub_irinitializer);
3855
3856                 advance_current_object(&path);
3857         }
3858
3859         assert(ARR_LEN(path.path) >= 1);
3860         ir_initializer_t *result = path.path[0].initializer;
3861         DEL_ARR_F(path.path);
3862
3863         return result;
3864 }
3865
3866 static ir_initializer_t *create_ir_initializer_string(
3867                 const initializer_string_t *initializer, type_t *type)
3868 {
3869         type = skip_typeref(type);
3870
3871         size_t            string_len    = initializer->string.size;
3872         assert(type->kind == TYPE_ARRAY);
3873         assert(type->array.size_constant);
3874         size_t            len           = type->array.size;
3875         ir_initializer_t *irinitializer = create_initializer_compound(len);
3876
3877         const char *string = initializer->string.begin;
3878         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3879
3880         for (size_t i = 0; i < len; ++i) {
3881                 char c = 0;
3882                 if (i < string_len)
3883                         c = string[i];
3884
3885                 ir_tarval        *tv = new_tarval_from_long(c, mode);
3886                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3887
3888                 set_initializer_compound_value(irinitializer, i, char_initializer);
3889         }
3890
3891         return irinitializer;
3892 }
3893
3894 static ir_initializer_t *create_ir_initializer_wide_string(
3895                 const initializer_wide_string_t *initializer, type_t *type)
3896 {
3897         assert(type->kind == TYPE_ARRAY);
3898         assert(type->array.size_constant);
3899         size_t            len           = type->array.size;
3900         size_t            string_len    = wstrlen(&initializer->string);
3901         ir_initializer_t *irinitializer = create_initializer_compound(len);
3902
3903         const char *p    = initializer->string.begin;
3904         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
3905
3906         for (size_t i = 0; i < len; ++i) {
3907                 utf32 c = 0;
3908                 if (i < string_len) {
3909                         c = read_utf8_char(&p);
3910                 }
3911                 ir_tarval *tv = new_tarval_from_long(c, mode);
3912                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3913
3914                 set_initializer_compound_value(irinitializer, i, char_initializer);
3915         }
3916
3917         return irinitializer;
3918 }
3919
3920 static ir_initializer_t *create_ir_initializer(
3921                 const initializer_t *initializer, type_t *type)
3922 {
3923         switch(initializer->kind) {
3924                 case INITIALIZER_STRING:
3925                         return create_ir_initializer_string(&initializer->string, type);
3926
3927                 case INITIALIZER_WIDE_STRING:
3928                         return create_ir_initializer_wide_string(&initializer->wide_string,
3929                                                                  type);
3930
3931                 case INITIALIZER_LIST:
3932                         return create_ir_initializer_list(&initializer->list, type);
3933
3934                 case INITIALIZER_VALUE:
3935                         return create_ir_initializer_value(&initializer->value);
3936
3937                 case INITIALIZER_DESIGNATOR:
3938                         panic("unexpected designator initializer found");
3939         }
3940         panic("unknown initializer");
3941 }
3942
3943 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3944  *  are elements [...] the remainder of the aggregate shall be initialized
3945  *  implicitly the same as objects that have static storage duration. */
3946 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3947                 ir_node *base_addr)
3948 {
3949         /* for unions we must NOT do anything for null initializers */
3950         ir_type *owner = get_entity_owner(entity);
3951         if (is_Union_type(owner)) {
3952                 return;
3953         }
3954
3955         ir_type *ent_type = get_entity_type(entity);
3956         /* create sub-initializers for a compound type */
3957         if (is_compound_type(ent_type)) {
3958                 unsigned n_members = get_compound_n_members(ent_type);
3959                 for (unsigned n = 0; n < n_members; ++n) {
3960                         ir_entity *member = get_compound_member(ent_type, n);
3961                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3962                                                                 member);
3963                         create_dynamic_null_initializer(member, dbgi, addr);
3964                 }
3965                 return;
3966         }
3967         if (is_Array_type(ent_type)) {
3968                 assert(has_array_upper_bound(ent_type, 0));
3969                 long n = get_array_upper_bound_int(ent_type, 0);
3970                 for (long i = 0; i < n; ++i) {
3971                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3972                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3973                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3974                         ir_node   *in[1]    = { cnst };
3975                         ir_entity *arrent   = get_array_element_entity(ent_type);
3976                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3977                                                         arrent);
3978                         create_dynamic_null_initializer(arrent, dbgi, addr);
3979                 }
3980                 return;
3981         }
3982
3983         ir_mode *value_mode = get_type_mode(ent_type);
3984         ir_node *node       = new_Const(get_mode_null(value_mode));
3985
3986         /* is it a bitfield type? */
3987         if (is_Primitive_type(ent_type) &&
3988                         get_primitive_base_type(ent_type) != NULL) {
3989                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3990                 return;
3991         }
3992
3993         ir_node *mem    = get_store();
3994         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3995         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3996         set_store(proj_m);
3997 }
3998
3999 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4000                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4001 {
4002         switch(get_initializer_kind(initializer)) {
4003         case IR_INITIALIZER_NULL:
4004                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4005                 return;
4006         case IR_INITIALIZER_CONST: {
4007                 ir_node *node     = get_initializer_const_value(initializer);
4008                 ir_type *ent_type = get_entity_type(entity);
4009
4010                 /* is it a bitfield type? */
4011                 if (is_Primitive_type(ent_type) &&
4012                                 get_primitive_base_type(ent_type) != NULL) {
4013                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4014                         return;
4015                 }
4016
4017                 assert(get_type_mode(type) == get_irn_mode(node));
4018                 ir_node *mem    = get_store();
4019                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4020                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4021                 set_store(proj_m);
4022                 return;
4023         }
4024         case IR_INITIALIZER_TARVAL: {
4025                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4026                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4027                 ir_type   *ent_type = get_entity_type(entity);
4028
4029                 /* is it a bitfield type? */
4030                 if (is_Primitive_type(ent_type) &&
4031                                 get_primitive_base_type(ent_type) != NULL) {
4032                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4033                         return;
4034                 }
4035
4036                 assert(get_type_mode(type) == get_tarval_mode(tv));
4037                 ir_node *mem    = get_store();
4038                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4039                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4040                 set_store(proj_m);
4041                 return;
4042         }
4043         case IR_INITIALIZER_COMPOUND: {
4044                 assert(is_compound_type(type) || is_Array_type(type));
4045                 int n_members;
4046                 if (is_Array_type(type)) {
4047                         assert(has_array_upper_bound(type, 0));
4048                         n_members = get_array_upper_bound_int(type, 0);
4049                 } else {
4050                         n_members = get_compound_n_members(type);
4051                 }
4052
4053                 if (get_initializer_compound_n_entries(initializer)
4054                                 != (unsigned) n_members)
4055                         panic("initializer doesn't match compound type");
4056
4057                 for (int i = 0; i < n_members; ++i) {
4058                         ir_node   *addr;
4059                         ir_type   *irtype;
4060                         ir_entity *sub_entity;
4061                         if (is_Array_type(type)) {
4062                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4063                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4064                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4065                                 ir_node   *in[1]    = { cnst };
4066                                 irtype     = get_array_element_type(type);
4067                                 sub_entity = get_array_element_entity(type);
4068                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4069                                                        sub_entity);
4070                         } else {
4071                                 sub_entity = get_compound_member(type, i);
4072                                 irtype     = get_entity_type(sub_entity);
4073                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4074                                                              sub_entity);
4075                         }
4076
4077                         ir_initializer_t *sub_init
4078                                 = get_initializer_compound_value(initializer, i);
4079
4080                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4081                                                        addr);
4082                 }
4083                 return;
4084         }
4085         }
4086
4087         panic("invalid IR_INITIALIZER found");
4088 }
4089
4090 static void create_dynamic_initializer(ir_initializer_t *initializer,
4091                 dbg_info *dbgi, ir_entity *entity)
4092 {
4093         ir_node *frame     = get_irg_frame(current_ir_graph);
4094         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4095         ir_type *type      = get_entity_type(entity);
4096
4097         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4098 }
4099
4100 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4101                                      ir_entity *entity, type_t *type)
4102 {
4103         ir_node *memory = get_store();
4104         ir_node *nomem  = new_NoMem();
4105         ir_node *frame  = get_irg_frame(current_ir_graph);
4106         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4107
4108         if (initializer->kind == INITIALIZER_VALUE) {
4109                 initializer_value_t *initializer_value = &initializer->value;
4110
4111                 ir_node *value = expression_to_firm(initializer_value->value);
4112                 type = skip_typeref(type);
4113                 assign_value(dbgi, addr, type, value);
4114                 return;
4115         }
4116
4117         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4118                 ir_initializer_t *irinitializer
4119                         = create_ir_initializer(initializer, type);
4120
4121                 create_dynamic_initializer(irinitializer, dbgi, entity);
4122                 return;
4123         }
4124
4125         /* create a "template" entity which is copied to the entity on the stack */
4126         ir_entity *const init_entity
4127                 = create_initializer_entity(dbgi, initializer, type);
4128         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4129         ir_type *const irtype   = get_ir_type(type);
4130         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4131
4132         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4133         set_store(copyb_mem);
4134 }
4135
4136 static void create_initializer_local_variable_entity(entity_t *entity)
4137 {
4138         assert(entity->kind == ENTITY_VARIABLE);
4139         initializer_t *initializer = entity->variable.initializer;
4140         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4141         ir_entity     *irentity    = entity->variable.v.entity;
4142         type_t        *type        = entity->declaration.type;
4143
4144         create_local_initializer(initializer, dbgi, irentity, type);
4145 }
4146
4147 static void create_variable_initializer(entity_t *entity)
4148 {
4149         assert(entity->kind == ENTITY_VARIABLE);
4150         initializer_t *initializer = entity->variable.initializer;
4151         if (initializer == NULL)
4152                 return;
4153
4154         declaration_kind_t declaration_kind
4155                 = (declaration_kind_t) entity->declaration.kind;
4156         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4157                 create_initializer_local_variable_entity(entity);
4158                 return;
4159         }
4160
4161         type_t            *type = entity->declaration.type;
4162         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4163
4164         if (initializer->kind == INITIALIZER_VALUE) {
4165                 expression_t *      value     = initializer->value.value;
4166                 type_t       *const init_type = skip_typeref(value->base.type);
4167
4168                 if (!is_type_scalar(init_type)) {
4169                         /* skip convs */
4170                         while (value->kind == EXPR_UNARY_CAST)
4171                                 value = value->unary.value;
4172
4173                         if (value->kind != EXPR_COMPOUND_LITERAL)
4174                                 panic("expected non-scalar initializer to be a compound literal");
4175                         initializer = value->compound_literal.initializer;
4176                         goto have_initializer;
4177                 }
4178
4179                 ir_node  *      node = expression_to_firm(value);
4180                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4181                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4182                 node = create_conv(dbgi, node, mode);
4183                 node = do_strict_conv(dbgi, node);
4184
4185                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4186                         set_value(entity->variable.v.value_number, node);
4187                 } else {
4188                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4189
4190                         ir_entity *irentity = entity->variable.v.entity;
4191
4192                         if (tq & TYPE_QUALIFIER_CONST
4193                                         && get_entity_owner(irentity) != get_tls_type()) {
4194                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4195                         }
4196                         set_atomic_ent_value(irentity, node);
4197                 }
4198         } else {
4199 have_initializer:
4200                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4201                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4202
4203                 ir_entity        *irentity        = entity->variable.v.entity;
4204                 ir_initializer_t *irinitializer
4205                         = create_ir_initializer(initializer, type);
4206
4207                 if (tq & TYPE_QUALIFIER_CONST) {
4208                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4209                 }
4210                 set_entity_initializer(irentity, irinitializer);
4211         }
4212 }
4213
4214 static void create_variable_length_array(entity_t *entity)
4215 {
4216         assert(entity->kind == ENTITY_VARIABLE);
4217         assert(entity->variable.initializer == NULL);
4218
4219         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4220         entity->variable.v.vla_base = NULL;
4221
4222         /* TODO: record VLA somewhere so we create the free node when we leave
4223          * it's scope */
4224 }
4225
4226 static void allocate_variable_length_array(entity_t *entity)
4227 {
4228         assert(entity->kind == ENTITY_VARIABLE);
4229         assert(entity->variable.initializer == NULL);
4230         assert(currently_reachable());
4231
4232         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4233         type_t   *type      = entity->declaration.type;
4234         ir_type  *el_type   = get_ir_type(type->array.element_type);
4235
4236         /* make sure size_node is calculated */
4237         get_type_size_node(type);
4238         ir_node  *elems = type->array.size_node;
4239         ir_node  *mem   = get_store();
4240         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4241
4242         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4243         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4244         set_store(proj_m);
4245
4246         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4247         entity->variable.v.vla_base = addr;
4248 }
4249
4250 /**
4251  * Creates a Firm local variable from a declaration.
4252  */
4253 static void create_local_variable(entity_t *entity)
4254 {
4255         assert(entity->kind == ENTITY_VARIABLE);
4256         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4257
4258         bool needs_entity = entity->variable.address_taken;
4259         type_t *type = skip_typeref(entity->declaration.type);
4260
4261         /* is it a variable length array? */
4262         if (is_type_array(type) && !type->array.size_constant) {
4263                 create_variable_length_array(entity);
4264                 return;
4265         } else if (is_type_array(type) || is_type_compound(type)) {
4266                 needs_entity = true;
4267         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4268                 needs_entity = true;
4269         }
4270
4271         if (needs_entity) {
4272                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4273                 create_variable_entity(entity,
4274                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4275                                        frame_type);
4276         } else {
4277                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4278                 entity->variable.v.value_number = next_value_number_function;
4279                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4280                                         entity);
4281                 ++next_value_number_function;
4282         }
4283 }
4284
4285 static void create_local_static_variable(entity_t *entity)
4286 {
4287         assert(entity->kind == ENTITY_VARIABLE);
4288         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4289
4290         type_t   *type           = skip_typeref(entity->declaration.type);
4291         ir_type  *const var_type = entity->variable.thread_local ?
4292                 get_tls_type() : get_glob_type();
4293         ir_type  *const irtype   = get_ir_type(type);
4294         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4295
4296         size_t l = strlen(entity->base.symbol->string);
4297         char   buf[l + sizeof(".%u")];
4298         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4299         ident     *const id       = id_unique(buf);
4300         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4301
4302         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4303                 set_entity_volatility(irentity, volatility_is_volatile);
4304         }
4305
4306         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4307         entity->variable.v.entity = irentity;
4308
4309         set_entity_ld_ident(irentity, id);
4310         set_entity_visibility(irentity, ir_visibility_local);
4311
4312         if (entity->variable.initializer == NULL) {
4313                 ir_initializer_t *null_init = get_initializer_null();
4314                 set_entity_initializer(irentity, null_init);
4315         }
4316
4317         ir_graph *const old_current_ir_graph = current_ir_graph;
4318         current_ir_graph = get_const_code_irg();
4319
4320         create_variable_initializer(entity);
4321
4322         assert(current_ir_graph == get_const_code_irg());
4323         current_ir_graph = old_current_ir_graph;
4324 }
4325
4326
4327
4328 static ir_node *return_statement_to_firm(return_statement_t *statement)
4329 {
4330         if (!currently_reachable())
4331                 return NULL;
4332
4333         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4334         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4335         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4336
4337         int in_len;
4338         if (!is_type_void(type)) {
4339                 ir_mode *const mode = get_ir_mode_storage(type);
4340                 if (res) {
4341                         res = create_conv(dbgi, res, mode);
4342                         res = do_strict_conv(dbgi, res);
4343                 } else {
4344                         res = new_Unknown(mode);
4345                 }
4346                 in_len = 1;
4347         } else {
4348                 in_len = 0;
4349         }
4350
4351         ir_node *const in[1] = { res };
4352         ir_node *const store = get_store();
4353         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4354
4355         ir_node *end_block = get_irg_end_block(current_ir_graph);
4356         add_immBlock_pred(end_block, ret);
4357
4358         set_unreachable_now();
4359         return NULL;
4360 }
4361
4362 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4363 {
4364         if (!currently_reachable())
4365                 return NULL;
4366
4367         return expression_to_firm(statement->expression);
4368 }
4369
4370 static void create_local_declarations(entity_t*);
4371
4372 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4373 {
4374         create_local_declarations(compound->scope.entities);
4375
4376         ir_node     *result    = NULL;
4377         statement_t *statement = compound->statements;
4378         for ( ; statement != NULL; statement = statement->base.next) {
4379                 result = statement_to_firm(statement);
4380         }
4381
4382         return result;
4383 }
4384
4385 static void create_global_variable(entity_t *entity)
4386 {
4387         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4388         ir_visibility       visibility = ir_visibility_external;
4389         storage_class_tag_t storage
4390                 = (storage_class_tag_t)entity->declaration.storage_class;
4391         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4392         assert(entity->kind == ENTITY_VARIABLE);
4393
4394         switch (storage) {
4395         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4396         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4397         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4398         case STORAGE_CLASS_TYPEDEF:
4399         case STORAGE_CLASS_AUTO:
4400         case STORAGE_CLASS_REGISTER:
4401                 panic("invalid storage class for global var");
4402         }
4403
4404         /* "common" symbols */
4405         if (storage == STORAGE_CLASS_NONE
4406             && entity->variable.initializer == NULL
4407             && !entity->variable.thread_local
4408             && (modifiers & DM_WEAK) == 0) {
4409                 linkage |= IR_LINKAGE_MERGE;
4410         }
4411
4412         ir_type *var_type = get_glob_type();
4413         if (entity->variable.thread_local) {
4414                 var_type = get_tls_type();
4415         }
4416         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4417         ir_entity *irentity = entity->variable.v.entity;
4418         add_entity_linkage(irentity, linkage);
4419         set_entity_visibility(irentity, visibility);
4420         if (entity->variable.initializer == NULL
4421             && storage != STORAGE_CLASS_EXTERN) {
4422                 ir_initializer_t *null_init = get_initializer_null();
4423                 set_entity_initializer(irentity, null_init);
4424         }
4425 }
4426
4427 static void create_local_declaration(entity_t *entity)
4428 {
4429         assert(is_declaration(entity));
4430
4431         /* construct type */
4432         (void) get_ir_type(entity->declaration.type);
4433         if (entity->base.symbol == NULL) {
4434                 return;
4435         }
4436
4437         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4438         case STORAGE_CLASS_STATIC:
4439                 if (entity->kind == ENTITY_FUNCTION) {
4440                         (void)get_function_entity(entity, NULL);
4441                 } else {
4442                         create_local_static_variable(entity);
4443                 }
4444                 return;
4445         case STORAGE_CLASS_EXTERN:
4446                 if (entity->kind == ENTITY_FUNCTION) {
4447                         assert(entity->function.statement == NULL);
4448                         (void)get_function_entity(entity, NULL);
4449                 } else {
4450                         create_global_variable(entity);
4451                         create_variable_initializer(entity);
4452                 }
4453                 return;
4454         case STORAGE_CLASS_NONE:
4455         case STORAGE_CLASS_AUTO:
4456         case STORAGE_CLASS_REGISTER:
4457                 if (entity->kind == ENTITY_FUNCTION) {
4458                         if (entity->function.statement != NULL) {
4459                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4460                                 (void)get_function_entity(entity, owner);
4461                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4462                                 enqueue_inner_function(entity);
4463                         } else {
4464                                 (void)get_function_entity(entity, NULL);
4465                         }
4466                 } else {
4467                         create_local_variable(entity);
4468                 }
4469                 return;
4470         case STORAGE_CLASS_TYPEDEF:
4471                 break;
4472         }
4473         panic("invalid storage class found");
4474 }
4475
4476 static void create_local_declarations(entity_t *e)
4477 {
4478         for (; e; e = e->base.next) {
4479                 if (is_declaration(e))
4480                         create_local_declaration(e);
4481         }
4482 }
4483
4484 static void initialize_local_declaration(entity_t *entity)
4485 {
4486         if (entity->base.symbol == NULL)
4487                 return;
4488
4489         // no need to emit code in dead blocks
4490         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4491                         && !currently_reachable())
4492                 return;
4493
4494         switch ((declaration_kind_t) entity->declaration.kind) {
4495         case DECLARATION_KIND_LOCAL_VARIABLE:
4496         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4497                 create_variable_initializer(entity);
4498                 return;
4499
4500         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4501                 allocate_variable_length_array(entity);
4502                 return;
4503
4504         case DECLARATION_KIND_COMPOUND_MEMBER:
4505         case DECLARATION_KIND_GLOBAL_VARIABLE:
4506         case DECLARATION_KIND_FUNCTION:
4507         case DECLARATION_KIND_INNER_FUNCTION:
4508                 return;
4509
4510         case DECLARATION_KIND_PARAMETER:
4511         case DECLARATION_KIND_PARAMETER_ENTITY:
4512                 panic("can't initialize parameters");
4513
4514         case DECLARATION_KIND_UNKNOWN:
4515                 panic("can't initialize unknown declaration");
4516         }
4517         panic("invalid declaration kind");
4518 }
4519
4520 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4521 {
4522         entity_t *entity = statement->declarations_begin;
4523         if (entity == NULL)
4524                 return NULL;
4525
4526         entity_t *const last = statement->declarations_end;
4527         for ( ;; entity = entity->base.next) {
4528                 if (is_declaration(entity)) {
4529                         initialize_local_declaration(entity);
4530                 } else if (entity->kind == ENTITY_TYPEDEF) {
4531                         /* §6.7.7:3  Any array size expressions associated with variable length
4532                          * array declarators are evaluated each time the declaration of the
4533                          * typedef name is reached in the order of execution. */
4534                         type_t *const type = skip_typeref(entity->typedefe.type);
4535                         if (is_type_array(type) && type->array.is_vla)
4536                                 get_vla_size(&type->array);
4537                 }
4538                 if (entity == last)
4539                         break;
4540         }
4541
4542         return NULL;
4543 }
4544
4545 static ir_node *if_statement_to_firm(if_statement_t *statement)
4546 {
4547         create_local_declarations(statement->scope.entities);
4548
4549         /* Create the condition. */
4550         ir_node *true_block  = NULL;
4551         ir_node *false_block = NULL;
4552         if (currently_reachable()) {
4553                 true_block  = new_immBlock();
4554                 false_block = new_immBlock();
4555                 create_condition_evaluation(statement->condition, true_block, false_block);
4556                 mature_immBlock(true_block);
4557                 mature_immBlock(false_block);
4558         }
4559
4560         /* Create the true statement. */
4561         set_cur_block(true_block);
4562         statement_to_firm(statement->true_statement);
4563         ir_node *fallthrough_block = get_cur_block();
4564
4565         /* Create the false statement. */
4566         set_cur_block(false_block);
4567         if (statement->false_statement != NULL) {
4568                 statement_to_firm(statement->false_statement);
4569         }
4570
4571         /* Handle the block after the if-statement.  Minor simplification and
4572          * optimisation: Reuse the false/true block as fallthrough block, if the
4573          * true/false statement does not pass control to the fallthrough block, e.g.
4574          * in the typical if (x) return; pattern. */
4575         if (fallthrough_block) {
4576                 if (currently_reachable()) {
4577                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4578                         ir_node *const f_jump = new_Jmp();
4579                         ir_node *const in[]   = { t_jump, f_jump };
4580                         fallthrough_block = new_Block(2, in);
4581                 }
4582                 set_cur_block(fallthrough_block);
4583         }
4584
4585         return NULL;
4586 }
4587
4588 /**
4589  * Add an unconditional jump to the target block.  If the source block is not
4590  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4591  * loops.  This is necessary if the jump potentially enters a loop.
4592  */
4593 static void jump_to(ir_node *const target_block)
4594 {
4595         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4596         add_immBlock_pred(target_block, pred);
4597 }
4598
4599 /**
4600  * Add an unconditional jump to the target block, if the current block is
4601  * reachable and do nothing otherwise.  This is only valid if the jump does not
4602  * enter a loop (a back edge is ok).
4603  */
4604 static void jump_if_reachable(ir_node *const target_block)
4605 {
4606         if (currently_reachable())
4607                 add_immBlock_pred(target_block, new_Jmp());
4608 }
4609
4610 static ir_node *while_statement_to_firm(while_statement_t *statement)
4611 {
4612         create_local_declarations(statement->scope.entities);
4613
4614         /* Create the header block */
4615         ir_node *const header_block = new_immBlock();
4616         jump_to(header_block);
4617
4618         /* Create the condition. */
4619         ir_node      *      body_block;
4620         ir_node      *      false_block;
4621         expression_t *const cond = statement->condition;
4622         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4623                         fold_constant_to_bool(cond)) {
4624                 /* Shortcut for while (true). */
4625                 body_block  = header_block;
4626                 false_block = NULL;
4627
4628                 keep_alive(header_block);
4629                 keep_all_memory(header_block);
4630         } else {
4631                 body_block  = new_immBlock();
4632                 false_block = new_immBlock();
4633
4634                 set_cur_block(header_block);
4635                 create_condition_evaluation(cond, body_block, false_block);
4636                 mature_immBlock(body_block);
4637         }
4638
4639         ir_node *const old_continue_label = continue_label;
4640         ir_node *const old_break_label    = break_label;
4641         continue_label = header_block;
4642         break_label    = false_block;
4643
4644         /* Create the loop body. */
4645         set_cur_block(body_block);
4646         statement_to_firm(statement->body);
4647         jump_if_reachable(header_block);
4648
4649         mature_immBlock(header_block);
4650         assert(false_block == NULL || false_block == break_label);
4651         false_block = break_label;
4652         if (false_block != NULL) {
4653                 mature_immBlock(false_block);
4654         }
4655         set_cur_block(false_block);
4656
4657         assert(continue_label == header_block);
4658         continue_label = old_continue_label;
4659         break_label    = old_break_label;
4660         return NULL;
4661 }
4662
4663 static ir_node *get_break_label(void)
4664 {
4665         if (break_label == NULL) {
4666                 break_label = new_immBlock();
4667         }
4668         return break_label;
4669 }
4670
4671 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4672 {
4673         create_local_declarations(statement->scope.entities);
4674
4675         /* create the header block */
4676         ir_node *header_block = new_immBlock();
4677
4678         /* the loop body */
4679         ir_node *body_block = new_immBlock();
4680         jump_to(body_block);
4681
4682         ir_node *old_continue_label = continue_label;
4683         ir_node *old_break_label    = break_label;
4684         continue_label              = header_block;
4685         break_label                 = NULL;
4686
4687         set_cur_block(body_block);
4688         statement_to_firm(statement->body);
4689         ir_node *const false_block = get_break_label();
4690
4691         assert(continue_label == header_block);
4692         continue_label = old_continue_label;
4693         break_label    = old_break_label;
4694
4695         jump_if_reachable(header_block);
4696
4697         /* create the condition */
4698         mature_immBlock(header_block);
4699         set_cur_block(header_block);
4700
4701         create_condition_evaluation(statement->condition, body_block, false_block);
4702         mature_immBlock(body_block);
4703         mature_immBlock(false_block);
4704
4705         set_cur_block(false_block);
4706         return NULL;
4707 }
4708
4709 static ir_node *for_statement_to_firm(for_statement_t *statement)
4710 {
4711         create_local_declarations(statement->scope.entities);
4712
4713         if (currently_reachable()) {
4714                 entity_t *entity = statement->scope.entities;
4715                 for ( ; entity != NULL; entity = entity->base.next) {
4716                         if (!is_declaration(entity))
4717                                 continue;
4718
4719                         initialize_local_declaration(entity);
4720                 }
4721
4722                 if (statement->initialisation != NULL) {
4723                         expression_to_firm(statement->initialisation);
4724                 }
4725         }
4726
4727         /* Create the header block */
4728         ir_node *const header_block = new_immBlock();
4729         jump_to(header_block);
4730
4731         /* Create the condition. */
4732         ir_node *body_block;
4733         ir_node *false_block;
4734         if (statement->condition != NULL) {
4735                 body_block  = new_immBlock();
4736                 false_block = new_immBlock();
4737
4738                 set_cur_block(header_block);
4739                 create_condition_evaluation(statement->condition, body_block, false_block);
4740                 mature_immBlock(body_block);
4741         } else {
4742                 /* for-ever. */
4743                 body_block  = header_block;
4744                 false_block = NULL;
4745
4746                 keep_alive(header_block);
4747                 keep_all_memory(header_block);
4748         }
4749
4750         /* Create the step block, if necessary. */
4751         ir_node      *      step_block = header_block;
4752         expression_t *const step       = statement->step;
4753         if (step != NULL) {
4754                 step_block = new_immBlock();
4755         }
4756
4757         ir_node *const old_continue_label = continue_label;
4758         ir_node *const old_break_label    = break_label;
4759         continue_label = step_block;
4760         break_label    = false_block;
4761
4762         /* Create the loop body. */
4763         set_cur_block(body_block);
4764         statement_to_firm(statement->body);
4765         jump_if_reachable(step_block);
4766
4767         /* Create the step code. */
4768         if (step != NULL) {
4769                 mature_immBlock(step_block);
4770                 set_cur_block(step_block);
4771                 expression_to_firm(step);
4772                 jump_if_reachable(header_block);
4773         }
4774
4775         mature_immBlock(header_block);
4776         assert(false_block == NULL || false_block == break_label);
4777         false_block = break_label;
4778         if (false_block != NULL) {
4779                 mature_immBlock(false_block);
4780         }
4781         set_cur_block(false_block);
4782
4783         assert(continue_label == step_block);
4784         continue_label = old_continue_label;
4785         break_label    = old_break_label;
4786         return NULL;
4787 }
4788
4789 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4790 {
4791         if (!currently_reachable())
4792                 return NULL;
4793
4794         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4795         ir_node  *jump = new_d_Jmp(dbgi);
4796         add_immBlock_pred(target_block, jump);
4797
4798         set_unreachable_now();
4799         return NULL;
4800 }
4801
4802 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4803 {
4804         /* determine number of cases */
4805         size_t n_cases = 0;
4806         for (case_label_statement_t *l = statement->first_case; l != NULL;
4807              l = l->next) {
4808                 /* default case */
4809                 if (l->expression == NULL)
4810                         continue;
4811                 if (l->is_empty_range)
4812                         continue;
4813                 ++n_cases;
4814         }
4815
4816         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4817         size_t           i   = 0;
4818         for (case_label_statement_t *l = statement->first_case; l != NULL;
4819              l = l->next) {
4820             if (l->expression == NULL) {
4821                         l->pn = pn_Switch_default;
4822                         continue;
4823                 }
4824                 if (l->is_empty_range)
4825                         continue;
4826                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4827                 ir_tarval *max = min;
4828                 long       pn  = (long) i+1;
4829                 if (l->end_range != NULL)
4830                         max = fold_constant_to_tarval(l->end_range);
4831                 ir_switch_table_set(res, i++, min, max, pn);
4832                 l->pn = pn;
4833         }
4834         return res;
4835 }
4836
4837 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4838 {
4839         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4840         ir_node  *switch_node = NULL;
4841
4842         if (currently_reachable()) {
4843                 ir_node *expression = expression_to_firm(statement->expression);
4844                 ir_switch_table *table = create_switch_table(statement);
4845                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4846
4847                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4848         }
4849
4850         set_unreachable_now();
4851
4852         ir_node *const old_switch            = current_switch;
4853         ir_node *const old_break_label       = break_label;
4854         const bool     old_saw_default_label = saw_default_label;
4855         saw_default_label                    = false;
4856         current_switch                       = switch_node;
4857         break_label                          = NULL;
4858
4859         statement_to_firm(statement->body);
4860
4861         if (currently_reachable()) {
4862                 add_immBlock_pred(get_break_label(), new_Jmp());
4863         }
4864
4865         if (!saw_default_label && switch_node) {
4866                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4867                 add_immBlock_pred(get_break_label(), proj);
4868         }
4869
4870         if (break_label != NULL) {
4871                 mature_immBlock(break_label);
4872         }
4873         set_cur_block(break_label);
4874
4875         assert(current_switch == switch_node);
4876         current_switch    = old_switch;
4877         break_label       = old_break_label;
4878         saw_default_label = old_saw_default_label;
4879         return NULL;
4880 }
4881
4882 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4883 {
4884         if (statement->is_empty_range)
4885                 return NULL;
4886
4887         if (current_switch != NULL) {
4888                 ir_node *block = new_immBlock();
4889                 /* Fallthrough from previous case */
4890                 jump_if_reachable(block);
4891
4892                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4893                 add_immBlock_pred(block, proj);
4894                 if (statement->expression == NULL)
4895                         saw_default_label = true;
4896
4897                 mature_immBlock(block);
4898                 set_cur_block(block);
4899         }
4900
4901         return statement_to_firm(statement->statement);
4902 }
4903
4904 static ir_node *label_to_firm(const label_statement_t *statement)
4905 {
4906         ir_node *block = get_label_block(statement->label);
4907         jump_to(block);
4908
4909         set_cur_block(block);
4910         keep_alive(block);
4911         keep_all_memory(block);
4912
4913         return statement_to_firm(statement->statement);
4914 }
4915
4916 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4917 {
4918         if (!currently_reachable())
4919                 return NULL;
4920
4921         ir_node  *const irn  = expression_to_firm(statement->expression);
4922         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4923         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
4924
4925         set_irn_link(ijmp, ijmp_list);
4926         ijmp_list = ijmp;
4927
4928         set_unreachable_now();
4929         return NULL;
4930 }
4931
4932 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4933 {
4934         bool needs_memory = false;
4935
4936         if (statement->is_volatile) {
4937                 needs_memory = true;
4938         }
4939
4940         size_t         n_clobbers = 0;
4941         asm_clobber_t *clobber    = statement->clobbers;
4942         for ( ; clobber != NULL; clobber = clobber->next) {
4943                 const char *clobber_str = clobber->clobber.begin;
4944
4945                 if (!be_is_valid_clobber(clobber_str)) {
4946                         errorf(&statement->base.source_position,
4947                                    "invalid clobber '%s' specified", clobber->clobber);
4948                         continue;
4949                 }
4950
4951                 if (streq(clobber_str, "memory")) {
4952                         needs_memory = true;
4953                         continue;
4954                 }
4955
4956                 ident *id = new_id_from_str(clobber_str);
4957                 obstack_ptr_grow(&asm_obst, id);
4958                 ++n_clobbers;
4959         }
4960         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4961         ident **clobbers = NULL;
4962         if (n_clobbers > 0) {
4963                 clobbers = obstack_finish(&asm_obst);
4964         }
4965
4966         size_t n_inputs  = 0;
4967         asm_argument_t *argument = statement->inputs;
4968         for ( ; argument != NULL; argument = argument->next)
4969                 n_inputs++;
4970         size_t n_outputs = 0;
4971         argument = statement->outputs;
4972         for ( ; argument != NULL; argument = argument->next)
4973                 n_outputs++;
4974
4975         unsigned next_pos = 0;
4976
4977         ir_node *ins[n_inputs + n_outputs + 1];
4978         size_t   in_size = 0;
4979
4980         ir_asm_constraint tmp_in_constraints[n_outputs];
4981
4982         const expression_t *out_exprs[n_outputs];
4983         ir_node            *out_addrs[n_outputs];
4984         size_t              out_size = 0;
4985
4986         argument = statement->outputs;
4987         for ( ; argument != NULL; argument = argument->next) {
4988                 const char *constraints = argument->constraints.begin;
4989                 asm_constraint_flags_t asm_flags
4990                         = be_parse_asm_constraints(constraints);
4991
4992                 {
4993                         source_position_t const *const pos = &statement->base.source_position;
4994                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4995                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
4996                         }
4997                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4998                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
4999                                 continue;
5000                         }
5001                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5002                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5003                                 continue;
5004                         }
5005                 }
5006
5007                 unsigned pos = next_pos++;
5008                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5009                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5010                         expression_t *expr = argument->expression;
5011                         ir_node      *addr = expression_to_addr(expr);
5012                         /* in+output, construct an artifical same_as constraint on the
5013                          * input */
5014                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5015                                 char     buf[64];
5016                                 ir_node *value = get_value_from_lvalue(expr, addr);
5017
5018                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5019
5020                                 ir_asm_constraint constraint;
5021                                 constraint.pos              = pos;
5022                                 constraint.constraint       = new_id_from_str(buf);
5023                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5024                                 tmp_in_constraints[in_size] = constraint;
5025                                 ins[in_size] = value;
5026
5027                                 ++in_size;
5028                         }
5029
5030                         out_exprs[out_size] = expr;
5031                         out_addrs[out_size] = addr;
5032                         ++out_size;
5033                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5034                         /* pure memory ops need no input (but we have to make sure we
5035                          * attach to the memory) */
5036                         assert(! (asm_flags &
5037                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5038                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5039                         needs_memory = true;
5040
5041                         /* we need to attach the address to the inputs */
5042                         expression_t *expr = argument->expression;
5043
5044                         ir_asm_constraint constraint;
5045                         constraint.pos              = pos;
5046                         constraint.constraint       = new_id_from_str(constraints);
5047                         constraint.mode             = mode_M;
5048                         tmp_in_constraints[in_size] = constraint;
5049
5050                         ins[in_size]          = expression_to_addr(expr);
5051                         ++in_size;
5052                         continue;
5053                 } else {
5054                         errorf(&statement->base.source_position,
5055                                "only modifiers but no place set in constraints '%s'",
5056                                constraints);
5057                         continue;
5058                 }
5059
5060                 ir_asm_constraint constraint;
5061                 constraint.pos        = pos;
5062                 constraint.constraint = new_id_from_str(constraints);
5063                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5064
5065                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5066         }
5067         assert(obstack_object_size(&asm_obst)
5068                         == out_size * sizeof(ir_asm_constraint));
5069         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5070
5071
5072         obstack_grow(&asm_obst, tmp_in_constraints,
5073                      in_size * sizeof(tmp_in_constraints[0]));
5074         /* find and count input and output arguments */
5075         argument = statement->inputs;
5076         for ( ; argument != NULL; argument = argument->next) {
5077                 const char *constraints = argument->constraints.begin;
5078                 asm_constraint_flags_t asm_flags
5079                         = be_parse_asm_constraints(constraints);
5080
5081                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5082                         errorf(&statement->base.source_position,
5083                                "some constraints in '%s' are not supported", constraints);
5084                         continue;
5085                 }
5086                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5087                         errorf(&statement->base.source_position,
5088                                "some constraints in '%s' are invalid", constraints);
5089                         continue;
5090                 }
5091                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5092                         errorf(&statement->base.source_position,
5093                                "write flag specified for input constraints '%s'",
5094                                constraints);
5095                         continue;
5096                 }
5097
5098                 ir_node *input;
5099                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5100                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5101                         /* we can treat this as "normal" input */
5102                         input = expression_to_firm(argument->expression);
5103                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5104                         /* pure memory ops need no input (but we have to make sure we
5105                          * attach to the memory) */
5106                         assert(! (asm_flags &
5107                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5108                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5109                         needs_memory = true;
5110                         input = expression_to_addr(argument->expression);
5111                 } else {
5112                         errorf(&statement->base.source_position,
5113                                "only modifiers but no place set in constraints '%s'",
5114                                constraints);
5115                         continue;
5116                 }
5117
5118                 ir_asm_constraint constraint;
5119                 constraint.pos        = next_pos++;
5120                 constraint.constraint = new_id_from_str(constraints);
5121                 constraint.mode       = get_irn_mode(input);
5122
5123                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5124                 ins[in_size++] = input;
5125         }
5126
5127         if (needs_memory) {
5128                 ir_asm_constraint constraint;
5129                 constraint.pos        = next_pos++;
5130                 constraint.constraint = new_id_from_str("");
5131                 constraint.mode       = mode_M;
5132
5133                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5134                 ins[in_size++] = get_store();
5135         }
5136
5137         assert(obstack_object_size(&asm_obst)
5138                         == in_size * sizeof(ir_asm_constraint));
5139         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5140
5141         /* create asm node */
5142         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5143
5144         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5145
5146         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5147                                   out_size, output_constraints,
5148                                   n_clobbers, clobbers, asm_text);
5149
5150         if (statement->is_volatile) {
5151                 set_irn_pinned(node, op_pin_state_pinned);
5152         } else {
5153                 set_irn_pinned(node, op_pin_state_floats);
5154         }
5155
5156         /* create output projs & connect them */
5157         if (needs_memory) {
5158                 ir_node *projm = new_Proj(node, mode_M, out_size);
5159                 set_store(projm);
5160         }
5161
5162         size_t i;
5163         for (i = 0; i < out_size; ++i) {
5164                 const expression_t *out_expr = out_exprs[i];
5165                 long                pn       = i;
5166                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5167                 ir_node            *proj     = new_Proj(node, mode, pn);
5168                 ir_node            *addr     = out_addrs[i];
5169
5170                 set_value_for_expression_addr(out_expr, proj, addr);
5171         }
5172
5173         return NULL;
5174 }
5175
5176 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5177 {
5178         statement_to_firm(statement->try_statement);
5179         source_position_t const *const pos = &statement->base.source_position;
5180         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5181         return NULL;
5182 }
5183
5184 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5185 {
5186         errorf(&statement->base.source_position, "__leave not supported yet");
5187         return NULL;
5188 }
5189
5190 /**
5191  * Transform a statement.
5192  */
5193 static ir_node *statement_to_firm(statement_t *const stmt)
5194 {
5195 #ifndef NDEBUG
5196         assert(!stmt->base.transformed);
5197         stmt->base.transformed = true;
5198 #endif
5199
5200         switch (stmt->kind) {
5201         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5202         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5203         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5204         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5205         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5206         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5207         case STATEMENT_EMPTY:         return NULL; /* nothing */
5208         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5209         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5210         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5211         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5212         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5213         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5214         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5215         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5216         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5217
5218         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5219         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5220         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5221
5222         case STATEMENT_ERROR: panic("error statement found");
5223         }
5224         panic("statement not implemented");
5225 }
5226
5227 static int count_local_variables(const entity_t *entity,
5228                                  const entity_t *const last)
5229 {
5230         int count = 0;
5231         entity_t const *const end = last != NULL ? last->base.next : NULL;
5232         for (; entity != end; entity = entity->base.next) {
5233                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5234                     !entity->variable.address_taken                                       &&
5235                     is_type_scalar(skip_typeref(entity->declaration.type)))
5236                         ++count;
5237         }
5238         return count;
5239 }
5240
5241 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5242 {
5243         int *const count = env;
5244
5245         switch (stmt->kind) {
5246         case STATEMENT_DECLARATION: {
5247                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5248                 *count += count_local_variables(decl_stmt->declarations_begin,
5249                                 decl_stmt->declarations_end);
5250                 break;
5251         }
5252
5253         case STATEMENT_FOR:
5254                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5255                 break;
5256
5257         default:
5258                 break;
5259         }
5260 }
5261
5262 /**
5263  * Return the number of local (alias free) variables used by a function.
5264  */
5265 static int get_function_n_local_vars(entity_t *entity)
5266 {
5267         const function_t *function = &entity->function;
5268         int count = 0;
5269
5270         /* count parameters */
5271         count += count_local_variables(function->parameters.entities, NULL);
5272
5273         /* count local variables declared in body */
5274         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5275         return count;
5276 }
5277
5278 /**
5279  * Build Firm code for the parameters of a function.
5280  */
5281 static void initialize_function_parameters(entity_t *entity)
5282 {
5283         assert(entity->kind == ENTITY_FUNCTION);
5284         ir_graph *irg             = current_ir_graph;
5285         ir_node  *args            = get_irg_args(irg);
5286         int       n               = 0;
5287         ir_type  *function_irtype;
5288
5289         if (entity->function.need_closure) {
5290                 /* add an extra parameter for the static link */
5291                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5292                 ++n;
5293
5294                 /* Matze: IMO this is wrong, nested functions should have an own
5295                  * type and not rely on strange parameters... */
5296                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5297         } else {
5298                 function_irtype = get_ir_type(entity->declaration.type);
5299         }
5300
5301
5302
5303         entity_t *parameter = entity->function.parameters.entities;
5304         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5305                 if (parameter->kind != ENTITY_PARAMETER)
5306                         continue;
5307
5308                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5309                 type_t *type = skip_typeref(parameter->declaration.type);
5310
5311                 assert(!is_type_array(type));
5312                 bool const needs_entity = parameter->variable.address_taken || is_type_compound(type);
5313
5314                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5315                 if (needs_entity) {
5316                         ir_type   *frame_type = get_irg_frame_type(irg);
5317                         ir_entity *param
5318                                 = new_parameter_entity(frame_type, n, param_irtype);
5319                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5320                         parameter->variable.v.entity = param;
5321                         continue;
5322                 }
5323
5324                 ir_mode *param_mode = get_type_mode(param_irtype);
5325                 long     pn         = n;
5326                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5327
5328                 ir_mode *mode = get_ir_mode_storage(type);
5329                 value = create_conv(NULL, value, mode);
5330                 value = do_strict_conv(NULL, value);
5331
5332                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5333                 parameter->variable.v.value_number = next_value_number_function;
5334                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5335                                         parameter);
5336                 ++next_value_number_function;
5337
5338                 set_value(parameter->variable.v.value_number, value);
5339         }
5340 }
5341
5342 /**
5343  * Handle additional decl modifiers for IR-graphs
5344  *
5345  * @param irg            the IR-graph
5346  * @param dec_modifiers  additional modifiers
5347  */
5348 static void handle_decl_modifier_irg(ir_graph *irg,
5349                                      decl_modifiers_t decl_modifiers)
5350 {
5351         if (decl_modifiers & DM_NAKED) {
5352                 /* TRUE if the declaration includes the Microsoft
5353                    __declspec(naked) specifier. */
5354                 add_irg_additional_properties(irg, mtp_property_naked);
5355         }
5356         if (decl_modifiers & DM_FORCEINLINE) {
5357                 /* TRUE if the declaration includes the
5358                    Microsoft __forceinline specifier. */
5359                 set_irg_inline_property(irg, irg_inline_forced);
5360         }
5361         if (decl_modifiers & DM_NOINLINE) {
5362                 /* TRUE if the declaration includes the Microsoft
5363                    __declspec(noinline) specifier. */
5364                 set_irg_inline_property(irg, irg_inline_forbidden);
5365         }
5366 }
5367
5368 static void add_function_pointer(ir_type *segment, ir_entity *method,
5369                                  const char *unique_template)
5370 {
5371         ir_type   *method_type  = get_entity_type(method);
5372         ir_type   *ptr_type     = new_type_pointer(method_type);
5373
5374         /* these entities don't really have a name but firm only allows
5375          * "" in ld_ident.
5376          * Note that we mustn't give these entities a name since for example
5377          * Mach-O doesn't allow them. */
5378         ident     *ide          = id_unique(unique_template);
5379         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5380         ir_graph  *irg          = get_const_code_irg();
5381         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5382                                                            method);
5383
5384         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5385         set_entity_compiler_generated(ptr, 1);
5386         set_entity_visibility(ptr, ir_visibility_private);
5387         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5388         set_atomic_ent_value(ptr, val);
5389 }
5390
5391 /**
5392  * Generate possible IJmp branches to a given label block.
5393  */
5394 static void gen_ijmp_branches(ir_node *block)
5395 {
5396         ir_node *ijmp;
5397         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5398                 add_immBlock_pred(block, ijmp);
5399         }
5400 }
5401
5402 /**
5403  * Create code for a function and all inner functions.
5404  *
5405  * @param entity  the function entity
5406  */
5407 static void create_function(entity_t *entity)
5408 {
5409         assert(entity->kind == ENTITY_FUNCTION);
5410         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5411
5412         if (entity->function.statement == NULL)
5413                 return;
5414
5415         inner_functions     = NULL;
5416         current_trampolines = NULL;
5417
5418         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5419                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5420                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5421         }
5422         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5423                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5424                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5425         }
5426
5427         current_function_entity = entity;
5428         current_function_name   = NULL;
5429         current_funcsig         = NULL;
5430
5431         assert(all_labels == NULL);
5432         all_labels = NEW_ARR_F(label_t *, 0);
5433         ijmp_list  = NULL;
5434
5435         int       n_local_vars = get_function_n_local_vars(entity);
5436         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5437         current_ir_graph = irg;
5438
5439         ir_graph *old_current_function = current_function;
5440         current_function = irg;
5441
5442         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5443         current_vararg_entity = NULL;
5444
5445         set_irg_fp_model(irg, firm_fp_model);
5446         tarval_enable_fp_ops(1);
5447         set_irn_dbg_info(get_irg_start_block(irg),
5448                          get_entity_dbg_info(function_entity));
5449
5450         /* set inline flags */
5451         if (entity->function.is_inline)
5452                 set_irg_inline_property(irg, irg_inline_recomended);
5453         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5454
5455         next_value_number_function = 0;
5456         initialize_function_parameters(entity);
5457         current_static_link = entity->function.static_link;
5458
5459         statement_to_firm(entity->function.statement);
5460
5461         ir_node *end_block = get_irg_end_block(irg);
5462
5463         /* do we have a return statement yet? */
5464         if (currently_reachable()) {
5465                 type_t *type = skip_typeref(entity->declaration.type);
5466                 assert(is_type_function(type));
5467                 type_t *const return_type = skip_typeref(type->function.return_type);
5468
5469                 ir_node *ret;
5470                 if (is_type_void(return_type)) {
5471                         ret = new_Return(get_store(), 0, NULL);
5472                 } else {
5473                         ir_mode *const mode = get_ir_mode_storage(return_type);
5474
5475                         ir_node *in[1];
5476                         /* §5.1.2.2.3 main implicitly returns 0 */
5477                         if (is_main(entity)) {
5478                                 in[0] = new_Const(get_mode_null(mode));
5479                         } else {
5480                                 in[0] = new_Unknown(mode);
5481                         }
5482                         ret = new_Return(get_store(), 1, in);
5483                 }
5484                 add_immBlock_pred(end_block, ret);
5485         }
5486
5487         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5488                 label_t *label = all_labels[i];
5489                 if (label->address_taken) {
5490                         gen_ijmp_branches(label->block);
5491                 }
5492                 mature_immBlock(label->block);
5493         }
5494
5495         DEL_ARR_F(all_labels);
5496         all_labels = NULL;
5497
5498         irg_finalize_cons(irg);
5499
5500         /* finalize the frame type */
5501         ir_type *frame_type = get_irg_frame_type(irg);
5502         int      n          = get_compound_n_members(frame_type);
5503         int      align_all  = 4;
5504         int      offset     = 0;
5505         for (int i = 0; i < n; ++i) {
5506                 ir_entity *member      = get_compound_member(frame_type, i);
5507                 ir_type   *entity_type = get_entity_type(member);
5508
5509                 int align = get_type_alignment_bytes(entity_type);
5510                 if (align > align_all)
5511                         align_all = align;
5512                 int misalign = 0;
5513                 if (align > 0) {
5514                         misalign  = offset % align;
5515                         if (misalign > 0) {
5516                                 offset += align - misalign;
5517                         }
5518                 }
5519
5520                 set_entity_offset(member, offset);
5521                 offset += get_type_size_bytes(entity_type);
5522         }
5523         set_type_size_bytes(frame_type, offset);
5524         set_type_alignment_bytes(frame_type, align_all);
5525
5526         irg_verify(irg, VERIFY_ENFORCE_SSA);
5527         current_vararg_entity = old_current_vararg_entity;
5528         current_function      = old_current_function;
5529
5530         if (current_trampolines != NULL) {
5531                 DEL_ARR_F(current_trampolines);
5532                 current_trampolines = NULL;
5533         }
5534
5535         /* create inner functions if any */
5536         entity_t **inner = inner_functions;
5537         if (inner != NULL) {
5538                 ir_type *rem_outer_frame      = current_outer_frame;
5539                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5540                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5541                         create_function(inner[i]);
5542                 }
5543                 DEL_ARR_F(inner);
5544
5545                 current_outer_frame      = rem_outer_frame;
5546         }
5547 }
5548
5549 static void scope_to_firm(scope_t *scope)
5550 {
5551         /* first pass: create declarations */
5552         entity_t *entity = scope->entities;
5553         for ( ; entity != NULL; entity = entity->base.next) {
5554                 if (entity->base.symbol == NULL)
5555                         continue;
5556
5557                 if (entity->kind == ENTITY_FUNCTION) {
5558                         if (entity->function.btk != BUILTIN_NONE) {
5559                                 /* builtins have no representation */
5560                                 continue;
5561                         }
5562                         (void)get_function_entity(entity, NULL);
5563                 } else if (entity->kind == ENTITY_VARIABLE) {
5564                         create_global_variable(entity);
5565                 } else if (entity->kind == ENTITY_NAMESPACE) {
5566                         scope_to_firm(&entity->namespacee.members);
5567                 }
5568         }
5569
5570         /* second pass: create code/initializers */
5571         entity = scope->entities;
5572         for ( ; entity != NULL; entity = entity->base.next) {
5573                 if (entity->base.symbol == NULL)
5574                         continue;
5575
5576                 if (entity->kind == ENTITY_FUNCTION) {
5577                         if (entity->function.btk != BUILTIN_NONE) {
5578                                 /* builtins have no representation */
5579                                 continue;
5580                         }
5581                         create_function(entity);
5582                 } else if (entity->kind == ENTITY_VARIABLE) {
5583                         assert(entity->declaration.kind
5584                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5585                         current_ir_graph = get_const_code_irg();
5586                         create_variable_initializer(entity);
5587                 }
5588         }
5589 }
5590
5591 void init_ast2firm(void)
5592 {
5593         obstack_init(&asm_obst);
5594         init_atomic_modes();
5595
5596         ir_set_debug_retrieve(dbg_retrieve);
5597         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5598
5599         /* create idents for all known runtime functions */
5600         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5601                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5602         }
5603
5604         entitymap_init(&entitymap);
5605 }
5606
5607 static void init_ir_types(void)
5608 {
5609         static int ir_types_initialized = 0;
5610         if (ir_types_initialized)
5611                 return;
5612         ir_types_initialized = 1;
5613
5614         ir_type_char    = get_ir_type(type_char);
5615         ir_type_wchar_t = get_ir_type(type_wchar_t);
5616
5617         be_params             = be_get_backend_param();
5618         mode_float_arithmetic = be_params->mode_float_arithmetic;
5619
5620         stack_param_align     = be_params->stack_param_align;
5621 }
5622
5623 void exit_ast2firm(void)
5624 {
5625         entitymap_destroy(&entitymap);
5626         obstack_free(&asm_obst, NULL);
5627 }
5628
5629 static void global_asm_to_firm(statement_t *s)
5630 {
5631         for (; s != NULL; s = s->base.next) {
5632                 assert(s->kind == STATEMENT_ASM);
5633
5634                 char const *const text = s->asms.asm_text.begin;
5635                 size_t      const size = s->asms.asm_text.size;
5636                 ident      *const id   = new_id_from_chars(text, size);
5637                 add_irp_asm(id);
5638         }
5639 }
5640
5641 static const char *get_cwd(void)
5642 {
5643         static char buf[1024];
5644         if (buf[0] == '\0')
5645                 getcwd(buf, sizeof(buf));
5646         return buf;
5647 }
5648
5649 void translation_unit_to_firm(translation_unit_t *unit)
5650 {
5651         if (c_mode & _CXX) {
5652                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5653         } else if (c_mode & _C99) {
5654                 be_dwarf_set_source_language(DW_LANG_C99);
5655         } else if (c_mode & _C89) {
5656                 be_dwarf_set_source_language(DW_LANG_C89);
5657         } else {
5658                 be_dwarf_set_source_language(DW_LANG_C);
5659         }
5660         be_dwarf_set_compilation_directory(get_cwd());
5661
5662         /* initialize firm arithmetic */
5663         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5664         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5665
5666         /* just to be sure */
5667         continue_label           = NULL;
5668         break_label              = NULL;
5669         current_switch           = NULL;
5670         current_translation_unit = unit;
5671
5672         init_ir_types();
5673
5674         scope_to_firm(&unit->scope);
5675         global_asm_to_firm(unit->global_asm);
5676
5677         current_ir_graph         = NULL;
5678         current_translation_unit = NULL;
5679 }